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Reil [10]
4 years ago
10

When calcium blood levels fall, a gland in the body releases a special hormone. This is a positive feedback loop, which means __

___.
A- calcium levels are increased
B- calcium levels are decreased
C- calcium levels remain the same
Biology
2 answers:
Eduardwww [97]4 years ago
6 0
A. because the hormone secreted is parathormone which regulates the calcium in the blood.
pls mark as brainliest
QveST [7]4 years ago
4 0

When calcium blood levels fall, a gland in the body releases a special hormone. This is a positive feedback loop, which means _____.

<h2><u>A) calcium levels are increased</u></h2>

B) calcium levels are decreased

C) calcium levels remain the same

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Part B: Research (11 points) In part B you will be doing some research on desertification.
Goryan [66]
Okay so northern Africa and the Sahara desert is the best example of desertification.
2 ways humans have contributed to that is: 1) pastoral nomadism 2) little to no settlements to increase water supply 

how it impacted the environment: so now the environment there is sandy, only organisms adapted for those extreme environment can live there ex. camel, cactus, etc., 

how it impacted quality of life: quality of life diminished, not enough water to sufficiently feed the populations, people live in extreme poverty, people are moving away, and the climate is very dry and hot, pretty much not a place anyone would want to live

http://eden-foundation.org/project/desertif.html

https://www.sciencedaily.com/releases/2017/03/170314111320.htm


8 0
3 years ago
How might the study of meteorites help astronomers determine the origin of meteoroids?
olganol [36]

Answer:

Through the study of meteorites, their chemical composition of silicates—material made of silicon and oxygen. Others contain metal—nickel and iron. Knowing what the meteorite was composed of lets you know where it came from. Chondrites are composed of hardened lava - this is occurred at the beginning of the solar system (4.5 mya). Carbonaceous chondrites contain carbon and water which formed away from the sun.

Explanation:

4 0
3 years ago
A man of unknown genotype has type B blood, his wife has type A blood (also unknown genotype). List ALL the blood types possible
shtirl [24]

Answer:

AB, aB, Ab

Explanation:

Man has blood type B so could be BB (homozygous dominant) or could be Bb (heterozygous)

Woman has blood type A, so she could be AA (heterozygous dominant) or Aa (heterozygous)

Now, we need to make a separate cross for woman with AA, man with BB and we get children of all AB

Then we can make another cross for genotypes Aa and BB, and we get AB and aB

We can continue this for AA,Bb and for Aa,Bb

5 0
3 years ago
Sally conducts an experiment measuring plant growth. She finds that after two weeks, a plant that receives water grew 4 cm, but
stealth61 [152]

Answer:

The correct answer is - the dependent variable.

Explanation:

In any study or research, the variable is that measured or affected by the change occurs lace in an experiment is called the dependent variable. The dependent variable depends on the factors or the variables that are changed in the experiment.

In this particular study, the variable which is measure is the height or growth of the plant which depends on the change in the hydrating supply so the dependent variable will be - the growth of the plant.

4 0
3 years ago
The browning of potatoes on contact with oxygen is caused by the enzyme reaction depicted above. Which of the following could in
hichkok12 [17]

Answer:

I think it is adding catechol oxidase

Explanation:

This is because more enzymes are able to take in more substrates, or reactants more quickly, therefore increasing the speed of the reaction.

Hope this helps!

8 0
3 years ago
Read 2 more answers
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