Meiosis is a process in which the number of chromosomes per cell is cut in half through the separation of homologous chromosomes in a diploid cell. Meiosis usually involves two distinct divisions called meiosis I and meiosis II. By the end of meiosis, a single diploid cell has produced four haploid cells.
After interphase I, the cell begins to divide, and the chromosomes pair up. In prophase 1 of meiosis, each replicated chromosome pairs with its corresponding homologous chromosome. This pairing forms a structure called a tetrad, which contains four chromatids. As the chromosomes pair, they sometimes undergo a process called crossing-over.
Which is a true statement of crossing-over?
A. Homologous chromosomes move to opposite ends of dividing cells
B. During crossing-over, bits and pieces of the homologous chromosomes are exchanged
C. The DNA of the diploid cell is copied
D. Crossing over decreases genetic diversity
Answers
Answer:
B.
Explanation:
D is wrong because it Increases gentetic diversity
C we are talking about the chromosome not the cell
A That is later on in telophase I
Related Questions
regarding thermoregulation a. in endotherms, the thermoneutral zone is the range of environmental temperatures over which the animal is able to thermoregulate without changing metabolic rate. b. ectotherms bur not endotherms use behavioral mechanisms to thermoregulate. c. as ambient temperature decreases, metabolic rate in an ectotherm decreases to maintain body temperature. d. both a) and b) are correct, and c) is incorrect e. a), b) and c) are all correct
Answers
The regarding thermoregulation -
both a) and b) are correct, and c) is incorrect
a) An animal with a excessive unit metabolic fee that remains the equal over a range of ambient temperatures is probably an endotherm
b) At low ambient temperature ectotherms use extra electricity and endotherms uses less energy
endotherm For ambient temperatures inside the thermoneutral quarter of an endotherm, a decrease in environmental temperature ends in accelerated vasoconstriction with out a alternate in metabolic rateWith appreciate to an animal's thermal price range, evaporation is the most effective form of heat switch that can not result in warmness advantage.some endotherms exhibit hibernation, a form of avoidance in which thermoregulation maintains with a lower body temperature setTo know more about endotherm visit : https://brainly.com/question/14523739
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3 trials of doing the egg drop with these materials: tape measure tape, masking cotton swabs eggs, raw cups balloons cotton balls newspaper – or magazines tissues
Answers
There are many constraints you can put on your egg drop challenge. Size, weight, materials, use of parachutes , the materials are tape measure tape.
What are the major components of an egg ?Some of the components of egg include the shell is a symmetrical, oval shape, seamless texture, and their lightweight, fragile made up of Calcium Carbonate (CaCO3), Semipermeable Pores which allow carbon dioxide pass out of the shell, exchange of gases occur.
The Bloom of shell is porous shield for protection, the Cuticle is a natural protective coating of the entire shell. second component are inner and outer membrane which is a thin, amino-acid rich layers provide protection.
The outer membrane is translucent, film-like gel like structure, inner egg membrane is the second translucent protein barrier, outer membrane adheres to the eggshell, the inner membrane surrounds the albumen of the egg.
Albumen or egg white mainly provide protection of the yolk as yolk is the figurative center of a healthy egg, serve as a shield to the yolk from movement and damage.
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Why it is important that the plant is kept at room temperature and given plenty of light , water and minerals during the experiment?
Answers
Answer:
To make it germinate well
Explanation:
A planted seed need the requirements to be able to grow well
Because without the listed above the plant will never grow
One primary advantage of light microscopy over electron microscopy is that ________.
Answers
Explain Your Reasoning Place an "x" in the appropriate box if the characteristic could describe science, pseudoscience, or both. What might this tell you about the relationship between science and
pseudoscience? Explain your reasoning.
Answers
Pseudoscience may sometimes permit personal opinions as evidence.
What is pseudoscience?The term pseudoscience refers to the reliance on logical explanations rather than empiricism to explain the observations in the universe. We know that science is empirical and results must be reproducible.
It is important to emphasize that the difference between science and pseudoscience is that science has an emphasis on empiricism and experiments are the only way that we could validate. Most of the earliest approaches to the study of the universe depended on pseudoscience.
The study of the natural world is the concern of both science and pseudoscience. The explanations in pseudoscience may sound logical but the results generated by science can be tested by others. The explanations of science can be proven false.
Lastly pseudoscience may sometimes permit personal opinions as evidence.
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adjacent neurons are separated by the: please choose the correct answer from the following choices, and then select the submit answer button. answer choices synaptic gap. myelin sheath. dendrite. axon.
Answers
The synaptic gap separates adjacent neurons.
What are neurons and what do neurons perform?Neurons are the primary functional components of the nervous system, and they generate electrical signals called action potentials, which allow them to quickly convey information over large distances. Although glia primarily support the neurons, they are nonetheless crucial for the proper operation of the nervous system.
What makes neurons so important?Information is transported throughout the human body by neurons. They assist in coordinating all of the vital operations of life by using electrical and chemical signals.
What three types of neurons are there?However, we may say that there are three different types of neurons in the spinal cord, sensory, motor, and interneurons.
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You conduct an experiment to determine the concentration of ions in an unknown solution. You place
300mL inside a dialysis bag and place the bag into a beaker of water with an ion concentration of 100
ppm (parts per million). When you check the experiment an hour later, the bag is swollen and has
taken In water. What can you conclude?
A. The concentration of ions of the unknown solution is more than 100
ppm.
B. Not enough information to determine.
C. The concentration of ions of the unknown solution is less than 100 ppm.
D. The solutions have the same concentrations.
Answers
Answer:
You can confidently conclude that the concentration of the unknown solution is less than 100ppm. Because the concentration of the liquid in the beaker is higher than that of the unknown solution that is why water move out of the dialysis bag into the beaker of water. Thus, the solution inside the beaker is an hypertonic solution, that is why it deflated the dialysis bag.
The diagram shows a model of an atom. The model contains three
different subatomic particles. Particles X and Y are inside the
nucleus, and particle Z is outside of the nucleus.
Model of an Atom
Which statements best describe the charges on the particles in this
model?
A Both particles X and Y have a positive charge.
Particle Z has a negative charge.
B. Both particles X and Y have a negative charge.
Particle Z has a positive charge.
C Either particle X or particle Y has a positive charge.
Particle Z has a negative charge.
D Either particle X or particle Y has a negative charge.
Particle Z has a positive charge.
Answers
In the Bohr atomic model, protons (+ charge) and neutrons (0 charge) compose the nucleus. Electrons (- charge) are circulating in orbits around the nucleus. C) Either particle X or particle Y has a positive charge. Particle Z has a negative charge.
What is the Bohr atom model?The atom Bohr model is a representation of atoms composition of and the interaction between these elements.
The model proposes a nucleus composed of neutrons and protons, and orbits around the nucleus with electrons on them.
There are different orbits around the nucleus, each with a certain energy. Each of these orbits is then the energy level. Electrons can gain or lose energy and jump from one level to another.
The model states that
Protons are particles with a positive charge occupying a small volume of the atom's size. Protons contain most of the atomic mass. Neutrons are particles that have no charge. Electrons are particles with negative charges circulating in orbits around the nucleus.There can be many orbits, each with a different size and energy level.The energy level is proportional to the orbit size. Each orbit has a different number of electrons. As electrons gain or lose energy, they move from one orbit to another.
In the exposed model,
X and Y - Protons and NeutronsZ - ElectronsNow, let us analyze the options,
A) Both particles X and Y have a positive charge. Particle Z has a negative charge.NO. X and Y do not have a positive charge, only one of them has.
B) Both particles X and Y have a negative charge. Particle Z has a positive charge.
NO. X and Y are positive and neutral, while Z is negative.
C) Either particle X or particle Y has a positive charge. Particle Z has a negative charge.
YES. Either X or Y are representing protons and neutrons, with positive and neutral charges, respectively. Z represents electrons with a negative charge.
D) Either particle X or particle Y has a negative charge. Particle Z has a positive charge.
NO. X and Y can have a positive or neutral charge. Z only negative charge.
According to this model description, the correct option is C).
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why do seeds need to be planted
Answers
Without seeds, there would be no plants and Earth would be a barren place that would not support the many forms of life that surround us every day.
Why do we eat? QER needs q e and r
then 1 - 3 sentence claim
need long answers
the question is biology based not regularly based
Answers
We stay in a international of plenty, with greater than sufficient meals to pick out from. Wander down any grocery shop aisle and surprise on the alternatives in each category.It''s now no longer as easy as you may think.
We pick out ingredients for plenty motives except hunger. (If consuming became as easy as setting fueloline in a car, we''d haven't any weight problems epidemic withinside the United States!) Personal taste, own circle of relatives preferences, cultural impacts, emotional motives, fitness concerns, societal pressures, convenience, cost, and range and amount of the to be had services all come into play while we pick out what to eat.
The United States enjoys one of the maximum ample meals elements withinside the international. But with abundance comes overeating and, ultimately, the scary weight benefit and associated fitness problems. While surveys record that we''re greater interested by weight loss program and fitness than ever before, the numbers of obese and overweight Americans inform a unique story.
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The abdominopelvic quadrants are formed by passing one horizontal and one vertical line through the.
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The abdominopelvic quadrants are formed by passing one horizontal and one vertical line through the Umbilicus.
Abdominopelvic cavity :The pelvic cavity and the abdominal cavity together make up the abdominopelvic cavity. The stomach, liver, pancreas, spleen, gallbladder, kidneys, small intestine, and the majority of the large intestine are all located in the abdominal cavity, which is the upper part of the body.
The right upper, right lower, left upper, and left lower quadrants are the four quadrants of the abdomen.
What are the abdominopelvic regions of the body?The umbilical region, hypogastric region, epigastric region, right and left iliac regions, right and left lumbar regions, right and left hypochondriac regions, and umbilical region are the nine abdominopelvic regions.
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the most abundant protein in the human body is (fill in the blank) ; it provides (fill in the blank). quizlet
Answers
Collagen is the most abundant protein in the human body.
Collagen is an essential component of all of our body's connective tissues. Our bones, skin, hair, joints, and other tissues all contain collagen. The skin may move, stretch, and recoil into shape with the help of collagen. The body contains collagen, which holds the cells together.
Without collagen, the body would disintegrate into nothing. A crucial structural protein of the numerous connective tissues of animals is collagen. Mammals produce a lot of protein, which accounts for 25 to 35 percent of the protein in the entire body.
Most collagen is found as elongated fibrils in fibrous tissues such tendons, ligaments, and skin.
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Explain why scientists probably used pcr when they prepared the dna for your experiment.
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ScientistsScientists probably used PCR when preparing the DNA for this experiment so they could start with a small sample of DNA and produce large quantities of the desired DNA strands from there.
Why is PCR beneficial?A specific DNA fragment can be amplified quickly using the highly sensitive PCR method. Gene sequences can be detected and identified using visual methods based on size and charge because PCR generates billions of copies of a particular DNA fragment or gene.
DNA polymerase is an essential component for PCR due to its key role in synthesizing new DNA strands.
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Natural selection and evolution are two terms that are sometimes confused, even by first year biology students. What is the relation between natural selection and evolution?.
Answers
Answer:
natural selection is a mechanism of evolution.
Explanation:
animals that adapt to their environment can survive and pass on the genes to their offspring
Hi there!
-Natural selection is a mechanism (or involved/a part) of evolution.
- Natural selection results in a change in the traits of people/indivduals in a population over the course of generations. Darwin proposed that through the process of natural selection, the physical or behavioral traits of organisms lead to increased survival or reproduction.
- This happens in a particular environment and becomes common within their population, while less favorable traits are lost.
- The changes building up and accumulating within populations via natural selection can lead to the development of new species.
Additional help (that helped me get 10/10 on this same quiz) was Quizlet. Just look up Chapter 11 Learning Guide for natural selection.
Hope this helps! Have a good day! :)
The __________ sends sound vibrations to the inner ear. a. malleus b. stapes c. incus d. tympanum please select the best answer from the choices provided a b c d
Answers
Answer: malleus
Explanation:
what is the physical state of dna after being denatured by heat? what is the physical state of dna after being denatured by heat? single-stranded individual nucleotides individual bases, sugars, and phosphates double-stranded
Answers
The physical state of dna following heat denature is single-stranded.
Definition of denature:To make unfit for consumption or consumption while retaining utility in other purposes, particularly by adding methanol to (ethyl alcohol).
What in an enzyme has been denatured?Enzymes become inactive due to denaturation, which is defined as conformational changes in the protein structure and active site of the enzyme.
How does protein denature occur?As a result of denaturation, many of the weak connections or bonds (such as hydrogen bonds) that give proteins their highly organized structure in their native (natural) state are broken. Most denatured proteins are insoluble and have a looser, more erratic structure.
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Which of the following is the standard seeding rate for corn planted in Southwestern drylands? 16,500 to 23,500 seeds per acre 16,500 to 23,500 seeds per acre 28,000 to 30,500 seeds per acre 28,000 to 30,500 seeds per acre 35,000 to 42,500 seeds per acre 35,000 to 42,500 seeds per acre 14,500 to 18,500 seeds per acre
Answers
The standard seeding rate for corn planted in Southwestern drylands is 14,500 to 18,500 seeds per acre and is denoted as option D.
What is Seeding rate?This is referred to as the amount of seed which is planted in a given area of land which is usually measured in hectares or acres so as to ensure that there is normal density of sprouts.
This is usually calculated so as to achieve a maximum yield or productivity and varies according to the climatic conditions and soil types. In the case of Southwestern drylands, the seeding rate is 14,500 to 18,500 seeds per acre.
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Which policy design will BEST ensure that brine shrimp will continue to live in the Great Salt Lake?
Answers
The Marine Protection, Research, and San.ctuaries Act is the legal framework that will most effectively guarantee that brine shrimp will continue to exist in the Great Salt Lake.
Describe a policy:This is referred to as a plan or set of rules that are established by people or organizations in order to accomplish long-term objectives.
By guaranteeing that there is no population from diverse sources, the Marine Protection, Research, and San/ctuaries Act was established to safeguard the marine environment.
The brine shri/mp, a representative of an organism that lives in the salt\ water environment, may migrate from the Great Salt Lake to more suitable locations as it becomes contaminated.
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Which of the following statements about succession is not true?
a.
Succession is the cause of ecosystem destruction.
b.
Succession is a process that allows communities to recover from disruptive events.
c.
The process of succession is necessary to maintain and establish stable communities.
d.
Succession can follow both human and natural events.
Please select the best answer from the choices provided
A
B
C
for edgen 2022
Answers
Answer:
A is not true
Explanation:
Succession is not the cause of ecosystem destruction, it is what follows up after destruction of an ecosystem.
Succession is the cause of ecosystem destruction is not true. Therefore, the statement is false.
What is succession?Succession refers to the changes in the composition and structure of plant and animal communities over time. It is a process taking place after a disturbance, such as a wildfire or human activity like mining.
Succession allows the ecosystem to establish a new equilibrium state to support a variety of species and establish a stable community by enabling the replacement of species that are better adapted to the new conditions.
In a forest after a disturbance, the first organisms to colonize are fast-growing species like grasses and herbs. As the forest matures, the new species become dominant until a stable, climax community is established. Succession provides habitat and food resources for a variety of species, thereby, regulating the ecosystem.
Therefore, succession helps ecosystems to recover and establish new equilibria.
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a firefighter wakes in the middle of the night to the sound of an alarm. it is likely that her have released epinephrine and norepinephrine. please choose the correct answer from the following choices, and then select the submit answer button. answer choices neural networks adrenal glands somatic and parasympathetic nervous systems reflex pathways
Answers
It is likely that her adrenal glands have released epinephrine and norepinephrine and is denoted as option B.
What is Adrenal gland?This is described as a small triangular-shaped glands which are located on top of both kidneys. They are responsible for various metabolic processes in the body due to their release of different types of substances.
The substances include epinephrine and norepinephrine and they act as a neurotransmitter and a hormone. They also play an important role in the body's fight-or-flight response as a result of the firefighter alarm which means a likely fire incident.
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increased oxidative stress with aging reduces chondrocyte survival: correlation with intracellular glutathione levels
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The role of oxidative pressure in mediating cell dying in chondrocytes remoted from the articular cartilage of glutathione levels and old grownup human tissue donors.
Cell dying prompted through the oxidant becomes evaluated within the alginate bead way of life system by the use of fluorescent probes to assess membrane integrity. generation of peroxynitrite by way of the decomposition of SIN-1 became shown by fantastic immunostaining of dealt with cells for 3-nitrotyrosine.
Evidence that multiplied oxidative stress with growing older makes chondrocytes greater liable to oxidant-mediated mobile demise through the dysregulation of the glutathione antioxidant machine.
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the condition called macular degeneration involves decreased function of the macula of the retina. what is the effect of this condition on vision?
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The condition called macular degeneration involves decreased function of the macula of the retina. The effect of this condition on vision is that: there occurs a loss of the central part of the field of vision.
Macular degeneration is caused due to damage in the blood vessels that leak any fluid or blood into the macula of the retina. As a result central vision is lost as the condition worsens with time. In older people, the disease may also cause permanent blindness.
Retina is a layer of tissue at the back of the eye which is most light-sensitive. It receives the light of the image and send the signals to the brain. As a result, the image of the object is formed.
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which list correctly arranges the structures of a motor neuron with respect to the order in which they receive information, from first to last?
Answers
The order of arrangement of the structure of a motor neuron is; dendrites, the cell body, axon, terminal branches of the axon.
What are motor neurons?The term motor neuron refers to the cell that can be found in the central nervous system that has the function of facilitating movement of the hands and feet as well as speech. Recall that the central nervous system consists of the brain and the spinal cord.
Thus, information is based from the brain to the motor neurons and then an action could be carried out effectively. The order of arrangement of the structure of a motor neuron is; dendrites, the cell body, axon, terminal branches of the axon.
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consider a mutation that alters an organism's traits so that it increases the likelihood of survival and reproduction of the organism. such a mutation may become more common in the population over time due to a process calle
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Genetic drift is such type of mutation that may become more common in the population and over time due to the process
Genetic drift is describes as the random fluctuations in the numbers of the gene variants in a population. Genetic drift may takes place when the occurrence of the variant forms of the gene, called as alleles, increases and also decreases by chance over time. These variations is the presence of alleles are to be measured as the changes in allele frequencies. In the population, the different of alleles that create the coat color are equally distributed. for example A disease which comes into the rabbit population and kills the 98 of the rabbits. The only rabbits that are is left are red and grey rabbits, simply by the chance. The genes have thus called “drifted” from 6 alleles to only 2.
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2. Using the ABO blood type alleles, cross a type O parent and a parent with AB blood.
Provide a Punnett Square and write out the genotype and phenotype probabilities of the offspring.
Answers
The IA allele offers kind A, IB offers kind B, and IO offers kind O. As each, IA and IB are dominant over IO, best IO/IO human beings have kind O blood.
Individuals with IA/IA or IA/IO have kind A blood and people with IB/IB or IB/IO have kind B. IA/IB human beings have each phenotypes due to the fact A and B explicit a unique dominance relationship is codominance, because of this that that kind A and B dad and mom will have an AB baby. A couple with kind A and kind B also can have a kind O baby if they're each heterozygous (IB/IO, IA/IO).
So, the viable blood organizations of the offspring of the dad and mom with blood institution O and AB are A and B due to the fact their dad and mom' genotypes are IO/IO and IA/IB. So, below crossing, we get best A and B blood organizations.
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Select the correct answer.
Which sentence supports the statement that complex, multicellular organisms are made up of specialized cells that each perform different functions for the body?
A.
Human liver cells make proteins that promote homeostasis that neurons do not.
B.
Different species of bacteria have different shapes and structures to their cells.
C.
The DNA in the cell nucleus of chimpanzees and humans are 98% identical.
D.
Prokaryotes do not have nuclei, but they can still carry out the basic functions of life.
Answers
Answer:Option A.
Explanation:
wilhelm et al. (2018) constraints on the metabolic activity of microorganisms in atacama surface soils inferred from refractory biomarkers: implications for martian habitability and biomarker detection. astrobiology, 19 (7). doi: 10.1089/ast.2017.1705
Answers
One of the greatest environmental obstacles to microbial viability is dryness. In order to objectively assess long-term habitability models of Mars and better define the environmental limits of life on Earth, it is important to understand the threshold of microbial tolerance to extreme dryness.
Implications for the habitability of Mars and the search for biomarkersThe Atacama Desert's hyperarid surface soils, which resemble Mars and receive only a few millimeters of precipitation per decade, were compared to biologically active soils a few hundred kilometers away that receive two to five times as much precipitation to measure biomolecular proxies for microbial adaptation and growth. With increased dryness, the diversity and amount of lipids and other biomolecules reduced.Only the wetter surface soils included cyclopropane fatty acids (CFAs), which are a sign of bacterial development and an adaptive response to environmental stress. All of our findings indicate that there is little to no in situ microbial growth in the driest surface soils of the Atacama, and that whatever metabolic activity there is likely restricted to cellular maintenance and repair. Our findings contribute to mounting evidence that the driest surface soils in the Atacama represent a threshold for long-term habitability (i.e., growth and reproduction). These findings limit the possibility of existent life existing on Mars' surface, which is 100–1000 times drier than the driest areas of the Atacama.learn more about biomarker here
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Give the translation for the mRNA and then use the codon table to get the amino acids. You only need to write the first three letters of the amino acids in the answer.
DNA - TAC - AAG - GTA - GCA - CAT - GGG
mRNA -
AAs -
(the question is in essay form)
Answers
The translation for mRNA is AUG - UUC - CAU - CGU - GUA - CCC
and for AAs it is Met - Phe - His - Arg - Val - Pro
What is transcription and translation?The transcription and translation of genes is an important and closed process, since it is exact. DNA transcription occurs first into an mRNA molecule and then passes from the nucleus to ribosomes for translation of the mRNA molecule into protein by linking amino acids.
These processes occur in all living things within the cell and the mitochondria also has its own translation process. All this process has to be given within the rules that the genetic code has, since each codon that is generated from DNA and RNA has its own corresponding amino acid.
Therefore, we can confirm that the translation for mRNA is AUG - UUC - CAU - CGU - GUA - CCC and for AAs it is Met - Phe - His - Arg - Val - Pro
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A. A worker for the Dept. of Wildlife Resources counted how man y deer he saw on 5 different plots of land on
November 15. Graph the following information in a BAR graph. Label and number the x and y-axis.
Plot
A
B
C₁
D
E
# of deer
36
32
12
20
24
1. What is the independent variable?
2. What is the dependent variable?
3. What is an appropriate title?
Answers
2. Dependent variable is number of deer
3. An appropriate title would be something along the lines of “Number of Deer Per Plot of Land”
who is the first true experiment and in which century
Answers
The first formal psychological experiment was carried out by Wundt, who attempted to gauge the speed of cognition by timing how long it took test subjects to reach a conclusion.
What was the first true experiment in psychology?The first formal psychological experiment was carried out by Wundt, who attempted to gauge the speed of cognition by timing how long it took test subjects to reach a conclusion.
The first genuine experimental study with a direct connection to physical activity and sports psychology was published by Norman Triplett. His interest in how to direct competition between two people affects performance served as the basis for his study.
A real experiment is one in which every effort is made to maintain control over all factors aside from the one being studied. This kind of control is frequently simpler to implement in a lab environment. As a result, genuine experiments have frequently been mistaken for laboratory studies.
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