Answer:
Part 1. The amount of calcium is independent variable.
Explanation:
An independent variable is a variable in an experiment which is changed to see its effects on dependent variable.
In this experiment, to know about the causes of osteoporosis, the Ca level in blood or calcium intake in changed.
So the concentration of calcium will be independent variable.
Part 2.
The risk of bone fractures is could be changed with calcium.
Explanation:
In this experiment osteoporosis or risk of bone fracture is dependent variable.
Dependent variable are results of experiment which can be changed by independent variable.
As in experiment, Calcium concentration is independent variable.
So the risk of osteoporosis depends can change with calcium.
Which of the following best describes osmosis?
Select one:
a.
Osmosis is the active transport of water across a membrane toward an area with a higher concentration of larger molecules.
b.
Osmosis is the spontaneous movement of water across a membrane toward an area with a lower concentration of larger molecules.
c.
Osmosis is the spontaneous movement of water across a membrane toward an area with a higher concentration of larger molecules.
d.
Osmosis is the active transport of water across a membrane toward an area with a lower concentration of larger molecules.
Osmosis is the type of passive diffusion in which, solvent molecules move from, a lower concentration of solute particles to a higher concentration of solute particles through a semipermeable membrane, hence option C is correct.
What is osmosis?It is the kind of passive transport that allows the transport of only solvent particles through the semipermeable membrane, on each side of the membrane concentration of solvent and solute particles having different concentrations.
It is not an active transport and does not require energy, the process is running till the equilibrium is reached at both sides of the membrane. it defines as the spontaneous movement of water.
Therefore, osmosis is the spontaneous movement of water from toward an area with a higher concentration of larger molecules through the membrane.
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Bleeding from a small cut soon stops due to the release of
enzymes from
1) Platelets
2) Activated Antibodies
3) Hemoglobin
4) White blood cells
Answer: 4) white blood cells
Explanation:
The bleeding from a small cut soon stops due to the release of platelets. Hence, option 1 is the correct answer. These are cell fragments of megakaryocytes.
What is a blood clot?When there is a cut, blood comes out of that organ. To prevent blood loss, the body has certain mechanisms. This mechanism is called blood clotting.
In the blood, different cells are present. Red blood cells (RBC), white blood cells (WBC), and megakaryocytes are present in the blood. The red blood cells supply oxygen to the different tissues. It consists of hemoglobin. The white blood cells protect the body from pathogens. Eosinophils, neutrophils, basophils, monocytes, etc. are white blood cells ( WBC)
Megakaryocytes are the cells that form platelets. These platelets are cell fragments of megakaryocytes. When a cut occurs, these platelets come to the site along with other clotting factors such as fibrinogen to form a network-like structure. Due to this network, the blood cells can't come out, and blood loss stops.
Hence, option 1 is the correct answer as platelets prevents the blood loss. Other options are incorrect.
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Which of the following organisms is likely to be in the lowest trophic level
of an ocean food chain?
O Leopard Seal
O Penguin
O Krill
O Plankton
O Fish
Answer: Plankton
Explanation:
Plankton are small organisms that exist in water and are too weak to swim against the currents of the ocean and the seas. This leads to them going wherever the currents take them. Plankton can be either plants or animals.
Of the organisms listed, they are on the lowest trophic level and provide a source of food to other organisms of different sizes ranging from krill to whales.
Which observation is evidence of refraction in this photo
Transcribe this dna : TATGCGAAA
Answer:
ATACGCTTT
Explanation:
DNA has the bases Adenine, Thymine, Guanine, and Cytosine
*Uracil is in RNA
Which of the following statements about prokaryotic cells is correct?
A) They reproduce asexually through a form of cell division called binary fission.
B) They contain multiple chromosomes floating in the cytoplasm.
C) They have a single DNA strand within a membrane-bound nucleus.
D) They reproduce sexually by exchanging genetic information during conjugation.
Answer:
A) They reproduce asexually through a form of cell division called binary fission.
Explanation:
It's similar to mitosis in eukaryotic cells
Identify where replication and transcription take place.
Answer:
well the DNA replication occurs in the nucleus. DNA transportation occurs in the nucleus. mRNA translation occurs at ribosomes.
Which substance is hydrophilic? Cellulose, testosterone, butter, cholesterol
Which of the following is true of sewage treatment plants in the United States?
A
They release wastewater before solids are removed from the sewage.
B
They use stormwater runoff to assist in the treatment process
с
They are not designed to remove pharmaceutical chemicals from wastewater.
D
They have largely eliminated cultural eutrophication in Chesapeake Bay
E
They release wastewater that is not regulated by the Clean Water Act.
The statement 'they are not designed to remove pharmaceutical chemicals from wastewater' is TRUE of sewage treatment plants in the United States (Option c).
What is sewage treatment?Sewage treatment refers to the procedures used to remove pollutants and contaminated substances from wastewater.
The sewage treatment is usually performed by specific treatment plants capable of eliminating different types of impurities from wastewater.Subsequently, treated water can then be newly discharged into the environment (e.g., water bodies) for its reuse.In conclusion, the statement 'they are not designed to remove pharmaceutical chemicals from wastewater' is TRUE of sewage treatment plants in the United States (Option c).
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Question 4 of 66
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Biology I Mid-Year-Assessment (2020-2021)
Question: 1-4
Biological macromolecules are organized into four major categories. What type of macromolecule contains phosphorus as part of a phosphate group?
SC.912.L.18.1
lipids
proteins
nucleic acids
O carbohydrates
Answer: C nucleic acids
Explanation:
I took it on quizz already in my class so the answer C
Answer: nucleic acids
Explanation: i took the test
Shelled protozoans become a part of _________________ layers
Write out the opposite strand of DNA
A T T G C G C G G A T T
Answer:
TAACGCGCCTAA
Explanation:
A's change to T's
G's change to C's and so on and so forth
T A A C G C G C C T A A............
Which two factors allow this cattail population to thrive in its ecosystem?
A. A harsh, cold climate
B. Nutrient-poor soil
OC. Adequate sunlight
D. Plentiful freshwater
Answer:
To be honest i think its D because cattails need water.
Explanation:
Answer:
c and d
Explanation:
Find at least 5 examples
of water in nature as a solid,
as a liquid, and as a gas
Answer:
ice, rain, snow, clouds, water vapor
Which option identifies what has occurred in the following scenario?
Ten years ago, Allie walked through a beautiful country forest filled with plants and animals. She decided to take a trip
to this forest again, only to find a bare field with no plant or animal life.
O conservation
pollution
O desertification
respiration
14. A(n)
__ is when a single base pair is altered.
substitution
point mutation
deletion
insertion
Answer:
point mutation
Explanation:
CAN SOMEONE PLEASE HELP ME WITH THIS SCIENCE QUESTION I WILL MARK YOU BRAINLIEST THANK YOU
Answer:
genetic engineering
Source: star trek
Answer:
genetic engineering also known as gmo
Explanation:
hope this helps
is it true that we see color because of the sun
Yes.
The sun emits all colors of the rainbow more or less evenly and in physics, we call this combination "white". That is why we can see so many different colors in the natural world under the illumination of sunlight. If sunlight were purely green, then everything outside would look green or dark.
The integrating center for homeostasis in the body is
If you cut your knee, pus, which is caused by _____, may form.
blood cells losing their hemoglobin
medicinal material excreted by macrophages
pathogens trying to infect the area
the death of macrophages
Answer:
The last one
Explanation:
Plants and animals can cause physical weathering.
Answer:
True
Explanation:
Tree roots that grow into crevices and small animals that burrow can cause physical weathering.
, where should the capillaries and lymphatic vessels be placed tomaximize the absorption of nutrients from food
Answer:
They should be placed in the small and large intestine.
Explanation:
The small and large intestine is the part of our digestive system that absorbs the nutrients from food. Previous to this step, the food went through the mouth, the esophagus, and the stomach. In those places, it was processed so that the intestines could absorb the nutrients from the food easily/
For nutrients to be absorbed, they should be in stretch contact with the intestines' walls where the smallest arteries, which are called capillaries, are present and will take the nutrients into its interior where the blood is. Also, the intestines have lymphatic vessels. These ones will protect our body from any antigen since they are part of our immune system.
Looking at the map below. predict what type of boundary is present and the resulting features of the boundary at the Philippine Plate and the Eurasian Plate
Eurasian Plate
Answer:
The answer is A - Convergent boundary resulting in earthquakes and volcanic activity
Explanation:
In map, Convergent boundary resulting in earthquakes and volcanic activity.
What do you mean by convergent boundary?A convergent boundary is an area on Earth where two or more lithospheric plates collide. One plate eventually slides beneath the other, a process known as subduction.
The subduction zone can be defined by a plane where many earthquakes occur, called the Wadati–Benioff zone. A convergent boundary is an area on Earth where two or more lithospheric plates collide.
Another form of convergent boundary is a collision where two continental plates meet head-on. Since neither plate is stronger than the other, they crumple and are pushed up.
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The graph shows the effect of pH on the rate of reaction to three different enzymes. What does the graph show?
Answer:
Regarding the effect of pH on the reaction rate of three different enzymes, what the graph shows is that each enzyme works better at different pH (option A).
Explanation:
Enzymes are specialized protein molecules whose function is to contribute to faster reactions with lower activation energy. To fulfill this function, enzymes must be in an optimal range of temperature and pH.
The graph shows three enzymes, one in an acidic medium, one in a neutral medium and one in a basic medium. The reaction rate of each enzyme is similar, indicating that each is working at an optimum pH. The best interpretation that can be drawn from the graph is that each enzyme works best at a different pH.
The other options are not correct because:
B. The variable "temperature" is not included in the graph.
C and D. Since the comparison of the reaction rate of a single enzyme at different pH is not being made, the graph is not useful to indicate whether an enzyme works better in acidic or basic conditions.
Abe
is an interference in the channel of communication
a а. Source
b. Feedforward
C Feedback
d. Noise
Please select the best answer from the choices provided
A
B
C
D
Answer:
i think the answer is A source
In regard to actin(the thin filaments) and myosin (the thick filaments), how do
muscles contract?
The globular heads of myosin tie actin, framing cross-spans between the good and bad fibers. This development slides the actin fibers from the two sides of the sarcomere toward the M line, shortening the sarcomere and bringing about muscle withdrawal.
This fossil from the Jurassic period looks much like
we find on Earth today.
A)
ferns
B)
fish
snails
D)
starfish
it looks much like ferns
Question 1 of 10
WORLD POPULATION GROWTH
20,000
10,000
5,000
World
2,000
Asia
1,000 Europe
Africa
Millions of people
500
209
United States,
Mexico
Canada, & Greenland
100
Central America,
s0 Caribbean Islands, &
South America
20
Oceania (Australia &
nearby islands in the Pacific)
10
2040
1980
2050
1950
1960
*970
Year
2000
2010
2020
2030
Based on the information in the graph, which region's population is currently
growing the least?
A. Australia
B. Europe
C. Asia
D. Africa
my
Answer:
The birth rate and death rate will be nearly equal
Explanation:
Why I know this because I just took the test
Based on the information in the graph Australia's population is currently growing the least.
How much has Australia's population grown in the last 50 years?Australia's population almost doubled in the past 50 years, from 13.1 million in 1971 to 25.7 million in 2021. But more remarkable is that this record population growth has exceeded all forecasts.
Why Australia is underpopulated?Australia has an average population density of 3.4 persons per square kilometre of total land area, which makes it one of the most sparsely populated countries in the world. This is generally attributed to the semi-arid and desert geography of much of the interior of the country.
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Which statement below best describes the function of the nucleus?
Answers:
a) Stores cells wastes and destructive enzymes
b) contains hereditary information and controls most of heredity and cell processes
c) directs cell division in animal cells
d) controls water pressure and stores wastes
Answer:
b) contains hereditary information and controls most of heredity and cell processes
it contains and protects DNA
Explanation:
The statement that best describes the function of the nucleus is that it contains hereditary information and controls most of the heredity and cell processes.
Cells are recognized as the building blocks that make up organisms. These cells are further made up of several structures that are well defined. Those well-defined forms of structures are referred to as organelles. The Endoplasmic reticulum, Mitochondria, and Nucleus are some of the examples of cells’ organelles.
The function and features of the nucleus are listed as follows:
The nucleus is described as the structure that is bounded by the membrane It is also considered the most noticeable organelle based on its function and size This organelle consists of the hereditary information of the particular cell and further helps in controlling the reproduction and growth of the cell.Thus, we can conclude that the statement “contains hereditary information and controls most of the heredity and cell processes” best explains the function of the nucleus.
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7. What are the reactants of the Krebs cycle? (select all that apply)
oxygen
glucose
FADH2
pyruvate
carbon dioxide
ATP
lactic acid
Answer:
co2 pyruvate atp fadh2
Explanation: