Answer:
i think it's helpful for you The fossil record, however, describes sudden, global extinctions that affect many species. These dramatic events are known as mass extinctions. Some populations seem more vulnerable than others: tropical forms of life have been drastically affected, while land plants tend to be highly resistant to mass extinctions.hi Mary can we friends ?
Extinction refers to the complete disappearance of a species or group of organisms from the Earth. Extinction can be caused by a variety of factors such as climate change, habitat destruction, competition, predation, disease, and human activities such as hunting and pollution.
Why fossil record is one of the most important sources of evidence?The fossil record is one of the most important sources of evidence for extinction events. When a species goes extinct, its fossils can still be found in the rock record, often in a particular layer of sediment that corresponds to the time period when the extinction occurred.
By studying the fossil record, scientists can identify periods in Earth's history when there was a sudden and widespread disappearance of species, which is known as a mass extinction event.
For example, the fossil record shows that there have been five major mass extinction events in the history of life on Earth, with the most famous being the extinction of the dinosaurs at the end of the Cretaceous period.
The extinction of the dinosaurs is marked by a distinct layer of sediment that contains high levels of iridium, which is rare in Earth's crust but is abundant in asteroids and comets. This layer of sediment suggests that a large asteroid impact may have triggered the extinction of the dinosaurs and many other species.
Overall, the fossil record provides valuable evidence for understanding the history of life on Earth, including the occurrence and causes of extinction events.
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Which of the following choices is not a concept related to B cells?
humoral immunity
antibodies
cell-mediated immunity
foreign pathogens
According to the research, the correct option is cell-mediated immunity. Cell-mediated immunity is not a concept related to B cells.
To find the correct option amongst all other options, we need to know more about B cells and which role they fulfill in the body.
What are B cells?The lymphocytes generated in the bone marrow whose main role is to be the only cells in the body capable of providing defense against microorganisms are called B cells.B cells are designed to create, produce and release antibodies that can identify and bind to foreign agents.They are the cellular basis of the humoral immunity, which is attributable to specific antibodies, the contrary of Cell-mediated immunity which is mediated by T lymphocytes.Thus, we can conclude that according to the research, the correct option is cell-mediated immunity. Cell-mediated immunity is not a concept related to B cells.
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How much biosphere extends to the distance?
Answer:
20 kilo meters(12 miles)
Which action is an example of using scientific thinking to make inferences?
OA. Researching existing knowledge about the natural world
0 0 0
B. Analyzing data and observations to form conclusions
OC. Using tools or measurements to collect data
D. Asking questions and being curious about the natural world
The action which is an example of using scientific thinking to make inferences is analyzing data and observations to form conclusions and is denoted as option B.
What is Scientific method?This is referred to as the process in which facts are established and questions are answered. They are mostly used by scientists in the formulation of a theory or law and involves processes such as the following:
ObservationExperimentationHypothesisInference etc.Inference is referred to as conclusion and is done when the appropriate data and observations have been analyzed which is why option B was chosen as the correct answer.
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experts believe that a good night sleep is vital to a success in school. Would kids that sleep 8 or more hours a night get better than kids who sleep less than 7 hours a night?
Sleep not only improves memory and learning, but it also has the power to prioritize memories by segmenting and arranging them according to emotional significance.
In essence, the more you learn, the more sleep you require, which is why getting a decent night's sleep is essential for doing well in school.
Many students skip sleep in order to earn good scores, yet studies show that those who sleep more often perform better academically.
Children and teenagers may struggle with attention, memory, and problem-solving skills if they don't get enough sleep.
Lack of sleep can also contribute to emotional problems and behavioral disorders that may impair academic performance. Teenagers require more sleep due to the rapid growth of their bodies and minds.
According to scientific studies, a lot of teenagers don't get enough sleep.
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Salivary amylase is an enzyme found in the mouth. It breaks down starch into sugars. Why will salivary amylase NOT break down proteins?
Select one:
a.
Only sugars have the correct shape to activate the enzyme.
b.
Proteins will not fit into the active site of the amylase enzyme.
c.
Proteins do not have the proper active site for the enzyme to work on them.
d.
The enzyme is the wrong substrate for proteins.
Find a scientific theory of your choice and summarize it below
Vacuoles usual hangouts. And where can it be found within a cell
Answer:
animal and plant cells
explanation:
cause they are storage bubbles
Label the diagram of the cell. Not sure if my answers are right so far.
Answer:
On the left... Chromatin
First of right... Ribosomes
Second... Rough endoplasmic reticulum
Third... Cytoplasm
Fourth... Lysosomes
How can reduced precipitation lead to limited water availability?
It may lead to overuse.
It makes water nonrenewable.
It contaminates current supplies.
It may lead to drought.
The way that reduced precipitation can lead to limited water availability is as follows: It may lead to drought (option D).
What is precipitation?Precipitation is any or all of the forms of water particles, whether liquid or solid, that fall from the upper atmosphere. Examples are rain, snow etc.
Precipitation is one of the major supplies of water to the Earth, hence, a reduction in the amount of precipitation (rainfall) will adversely affect the availability of water by causing drought, which is a period of unusually low rainfall.
Therefore, it can be said that the way that reduced precipitation can lead to limited water availability is as follows: It may lead to drought.
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Answer: D
Explanation: it may lead to drought
What is “big data” and why do we need statistics to analyze it?
Answer:
Because there is statistics only is the one of the best way to analysis of the ( big data).
Which of the following is the best title for this passage? A The Grand Canyon B Geology C Tilted Rocks D Unconformities
construct a food web for a hawk, snake, toads, chicken, grasshopper, termite,lizard, worms and green plants
A food web is a diagram that shows what is eaten by what in an ecological community and how food chains naturally connect to one another.
All life forms can be generically categorized by ecologists into one of two trophic levels: 1) the autotrophs, and 2) the heterotrophs. Autotrophs convert inorganic materials, such as minerals and gases like carbon dioxide, into organic matter in order to sustain their bodies, grow, develop, and reproduce.A food web's connections show the various feeding routes, such as how heterotrophs consume the organic matter produced by autotrophs and other heterotrophs to receive organic matter themselves. The different feeding strategies that connect an ecosystem into a single system of trade are depicted in a simplified way by the food web.Find the food web picture attached below.
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IN YOUR OWN WORDS , summarize what Creutzfeldt-Jakob disease is, how it is transmitted, treated, and found.
According to the research, Creutzfeldt-Jakob disease is an infectious disease of the CNS, produced by altered prion proteins that causes advanced dementia and leads to a rapid decrease in movement.
What is Creutzfeldt-Jakob disease?It is an encephalopathy associated with a spongiform degeneration of the central nervous system (CNS) and is related to the accumulation of altered prion proteins, that is, they have lost their normal function but have acquired the ability to transform the normal form into a pathological one.
In this sense, its transmission can be horizontal or vertical and its symptoms include:
DementiaMemory impairmentMuscle coordination problemsOn the other hand, its treatment is aimed at relieving symptoms such as involuntary muscle contractions, since it is considered to lead to death given that altered prion proteins are extremely resistant to commonly used disinfectant and sterilizing treatments.
Therefore, we can conclude that according to the research, Creutzfeldt-Jakob disease is an infectious disease of the CNS, produced by altered prion proteins that causes advanced dementia and leads to a rapid decrease in movement.
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An example of the use of sugar/starches is
Why do we use SI units in science?
Answer:
The SI system is used to exchange and sell goods all over the world. Science and research also use SI units to measure scientific quantities
What should you never do when you switch objectives, e.g., from scanning power to low
power or from low power to high power?
WIL
The lens will move either towards the specimen or away from the specimen.
The microscope is the tool or device used to see the very minute organisms which are not visible by the normal eye and is used in many places like laboratories, offices, schools, colleges , in research labs, and is used for the purpose of scientific research and seeing the detailed structures of the objects and has many components like ocular lenses, slide placer, light reflector and so on and there are methods which can to change the length of the lens or they can be adjusted to different powers like 4x, 10x, or 40 x or 100 x to see very minute to minute details and when you change the power from low to high the high power objective lens will change and directly start moving towards or over the specimen and when it changes from the high power to low power then the low power objective lens rotaes away from the specimens and due to theses changes it can alter the magnification of the specimen and also the intensity of the light and also can increase or decresa the area of the surface which is veiwed and the depth of feild is also changed and also thw working of distance and resolution burt the fact is even if the power is changed the image can be adjusted and focused and it should be to have clear image of the object placed under microscope.
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Which part of the DNA model is most directly associated with the coding of genetic information?
The linear arrangement of nucleotides in DNA contains genetic information. A hydrogen bond between the G-C and A-T base pairs holds each DNA molecule's two complementary strands of nucleotides together to create a double helix. Thus, option D is correct.
What part of DNA code for genetic information?Each sugar group has a nucleotide base, a ringed nitrogen molecule, and it is the arrangement of these bases that encodes the genetic instructions for making proteins.
Genes store the instructions needed to produce particular proteins, which are responsible for an individual's unique characteristics.
Each gene can have many alleles, or variants, that each code for a different version of the desired trait. A cell's chromosomes, which each contain several genes, are home to those genes.
Therefore, nucleotide part of the DNA model is most directly associated with the coding of genetic information.
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Which of the following are difference(s) between gram-positive bacteria and gram-negative bacteria?
are Gram-positive bacteria are all coccus and spirillus shape; Gram-negative bacteria are all bacillus shaped.???
Answer: gram negative bacteria are rod, bacillus shaped
Explanation:
gram positive are arranged in many shapes like cocci or spirillus.
The lungs of an animal, shown here, exchange gases with the environment to allow for oxygen to move in and carbon dioxide to move out. The description of the function of the lungs is most similar to the explanation of what organelle within the eukaryotic cell?
A cell wall
B cytoplasm
C nucleus
D cell membrane
Cell theory states that all living things contain one or more cells. Why do you think cell theory meets the definition of a scientific theory?
The cell theory meets the scientific unified cell theories because still there are living entities which create example for unicellular and multicellular examples.
The cell theory is known as the structural and functional unit of life because it is the smallest unit and without it, life is not possible as the cell contains the nucleus which is the brain of the cell and the unit through which hereditary material is transferred between the generations and also it contains other cell organelles responsible for all kinds of cellular functions and depending upon the number of cell the body can be simple or complex as unicellular organism like amoeba they are very simple and eukaryotes like human , fungi, protists, plants and animals all are multicellular and that is why there body is complex and cell theory meets the definition because the cell is being tested for a longer period of time and also it was given by Robert brown that cell theory are formed from the pre existing cells called as Omnis cellular and there are many theories like big bang theory which suggests that the first cell was formed from the inorganic material and this theory is also called as unified cell theory and Rudolf Virchow gave many postulates to support this theory later.
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Is increased brain size a Biological Characteristic?
Answer:
Yes it is
Explanation:
Since we face many problems in the future. The brain gets bigger and as we produce our kids they may have some
I think .-.
Biodiversity is important for the sustainability of ecosystems. However, many of the human actions that are aimed at growing communities are decreasing the biodiversity of these areas, leaving populations and ecosystems vulnerable. As human populations grow, the terrestrial and aquatic ecosystems they use may be transformed by the efforts of human beings and biodiversity losses typically accompany these processes. Which of these actions decrease biodiversity and threaten sustainability? Select ALL that apply
Pollution and Overexploitation of the natural environment are the actions that decrease biodiversity and threaten sustainability.
What factors decrease biodiversity and threaten sustainability?Climate change, Pollution, Destruction of habitats, Invasive alien species and Overexploitation of the natural environment are the actions that decrease biodiversity and threaten sustainability. Human activities can cause great damaged to the environment because human activities causes pollution which make the environment and biodiversity adversely affected. Burning of fossil produces carbondioxide which is a greenhouse gas which is responsible for the global warming and sea level rise.
So we can conclude that Pollution and Overexploitation of the natural environment are the actions that decrease biodiversity and threaten sustainability.
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i want the answer please i want the answerrrr
The correct answer is "Blood should not be written on the table. Blood is basic".
Solutions are ranked according to their acidity or basicity (alkalinity) using the pH scale. The scale is logarithmic since it is based on pH values, which means that a change of 1 pH unit corresponds to a ten-fold change in the concentration of H+ ions. The pH scale is frequently stated to range from 0 to 14, while it is conceivable to have a pH below 0 or over 14. Most solutions however fall within this range. Acidic substances have a pH value less than 7 while alkaline or basic substances have a pH value greater than 7. A pH value of 7 is said to be neutral. In the example, orange juice, vinegar and hydrochloric acid have pH values less than 7. Hence, these are acidic substances. However, since blood has a pH of 7.4, it is considered as slightly basic.
Therefore, the best choice is "Blood should not be written on the table. Blood is basic".
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A classification grouping that consists of a number of similar, closely related species?
According to the research, the correct option is genus. A classification grouping that consists of a number of similar, closely related species is called a genus.
What is a genus?It is a taxonomic category that is part of systematic biology, which is located between the family and the species, that is, it includes many species that are related to each other.
In this sense, it is a taxon that allows living beings to be classified based on a hierarchy of inclusion, in this case grouping together closely related species, being a group of organisms that in turn can be divided into several species.
Therefore, we can conclude that according to the research, the correct option is genus. A classification grouping that consists of a number of similar, closely related species is called a genus.
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What makes aquatic ecosystems different?
Answer:
Aquatic ecosystems perform numerous valuable environmental functions. They recycle nutrients, purify water, attenuate floods, augment and maintain streamflow, recharge ground water, and provide habitat for wildlife and recreation for people.
A property of multiplication is used to simplify each expression. Select the property used in each simplification. A -5 ×13×6 = -5×(13×6) = -5 × 2 = -10 Commutative Property Associative Property Distributive Property B 30 × 116 = 30×(1+16) = 30 × 1 + 30 × 16 = 30 + 5 = 35 Commutative Property Associative Property Distributive Property C 25× (-8) × 10 = 25 × 10 × (-8) = 4 × (-8) = -32 Commutative Property Associative Property Distributive Property D -1.2×3×100 = -1.2×100×3 = -120 × 3 = -360 Commutative Property Associative Property Distributive Property
The property that is used for the simplification of the expression (-1.2×3×100) is the Commutative Property of multiplication.
What is multiplication?Multiplication is defined as the major type of arithmetic operations that involves repeated addition of groups of equal size.
There are various properties of multiplication which include the following:
Commutative Property: Associative Property Distributive PropertyCommutative Property: This states that when multiplying the terms through any order to simplify them, the answer will remain the same.
Therefore, 1.2×3×100 = -360
-1.2×100×3 = -120 × 3 = -360.
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Cells are able to pump ions across their membranes in opposition to a concentration gradient due to
A) the destruction of electrons within the cell
B) a drop in temperature outside the cell
C) an expenditure of energy by the cell
D) a vacuole formation within the cell
Cells are able to pump ions across their membranes in opposition to a concentration gradient due to an expenditure of energy by the cell; option C.
What is active transport?Active transport refers to a form of transport that occurs in the cell in which energy is expended in the form of ATP to transport molecules from one point to the other within the cell or outside the cell.
Usually, when energy is expended in the transport of molecules, it is done against the concentration gradient.
When molecules move down their concentration gradient, they move by simple diffusion.
Therefore, cells are able to pump ions across their membranes in opposition to a concentration gradient due to an expenditure of energy by the cell.
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Exam-style questions
A student is investigating the effect of different wavelengths of light on photosynthesis.
They use the following equipment:
● a lamp
• coloured light filters
a metre rule
a conical flask
●
0.2% sodium hydrogencarbonate solution
a gas syringe
a sample of pondweed
Plan an experiment to allow the student to collect valid data.
You should identify any control variables.
●
The experiment can be used to investigate the influence of light intensity on the rate of photosynthesis.
Aim:To investigate the influence of light intensity on the rate of photosynthesis.
Procedure: Cut the stem of a bubbling pond weed to around 5cm in length. In a test tube containing sodium hydrogen carbonate solution, place the sliced surface facing upwards.Insert the test tube into the water-filled beaker and record the water's temperature. The temperature of the water in the beaker should be monitored periodically to ensure that it remains steady during the experiment. Connect the gas-collection equipmentPosition the lamp 10 cm from the beaker. Give the plant two to three minutes to acclimate to the light intensity.Place the capillary tube/test tube onto the cut tip of the pondweed when the rate of air bubbles is regular and acceptable (>10 bubbles/minute), and then measure the volume. Alternately, count the bubbles. Get the average of the findings by repeating the process twice.Steps 5 and 6 should be repeated at increasing distances from the light source, such as 20 cm, 30 cm, 40 cm, and 50 cm. Summarize the findings in a table and then graph the oxygen volume per minute OR the number of bubbles per minute versus the distance between the light and the plant.Variables:Light intensity and distance from the light source are independent variables.The number of bubbles created each minute is the dependent variable.Control variables include temperature, the identical piece of Cabomba pondweed used each time, and the sodium hydrogen carbonate solution concentration.ObservationThe amount of oxygen, or the rate of bubble formation, increases as light intensity increases (the distance between the lamp and the plant decreases). This shows that photosynthesis accelerates as the light intensity rises.
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Describe the structural differences between a plant and animal cell.
Answer:
plant cell is rectangular in shape where animal cell is spherical/oval in shape
If you want your friend to guess whether you have a bacteria or yeast sample by answering the clues you have about their properties like shape, size, composition.
What two clues you can give to make them easily distinguish between bacteria and yeast
b. What two clues you can give them to make them confused so that they can’t. decide whether they are bacteria or plant cell
The answers include the following:
The two clues you can give to make them easily distinguish between bacteria and yeast is that yeast has a single nucleus per cell, while bacteria does not have a nucleus.The two clues which can make them confused so that they can’t. decide whether they are bacteria or plant cell is that they both possess cell wall.What is Yeast?This is an organism which belongs to the fungus kingdom and is an eukaryotic, single-celled microorganisms with the presence of one nucleus which is what differentiates it from bacteria as it possesses none.
Bacteria and yeast have cell wall which is the organelle responsible for maintaining their structural integrity while bacteria has no nucleus and yeast has one which differentiates them which is therefore the reason why it was chosen as the correct answer.
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