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Iteru [2.4K]
3 years ago
6

Where does positive selection of t cells occur?

Biology
1 answer:
erik [133]3 years ago
3 0
Positive selection of t cells occur in .the thymus
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Why does the human body maintain a constant pH of its blood
IRISSAK [1]
Because if there is a minimal variation of it the normal state of pH, it can cause severe effects in the brain, arteries, the heart, and other organs. 
In other words, it can have some serious effects on the body systems that can lead big diseases, like cancer. 
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Coral reefs cover less than ___ of the ocean floor. <br> A)1% <br> B)2% <br> C)4% <br> D)3%
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c

Explanation:

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Anna007 [38]

Energy is decreasing by 500 because some of it is turned into heat energy.

Explanation:

when an animal/creature consumes another living thing and or something that has energy it is decrease to a certain amount because some of the energy that the original animal/creature had is turned into heat energy because they use some of the energy for themselves to survive and live.

For example:

A flower is a producer because it produces energy and gets it gets eaten by a deer and some energy gets changed to heat and the other is consumed by the consumer (the deer) and so on.

6 0
3 years ago
An increase in the volume of forests and phytoplankton would lead to a reduction in free "blank" , which in turn could cause a d
lord [1]

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The forests and phytoplankton are carbon sinks, which absorbs the green house gas carbon dioxide from the atmosphere for photosynthesis. The carbon dioxide from the atmosphere and water are used as reactant in photosynthesis to yield carbohydrates and oxygen as products. Thus the carbon dioxide level in atmosphere decreases. This is necessary for controlling pollution in the environment and reducing the environmental temperature as carbon dioxide can make the environment warm.

5 0
2 years ago
What is the process of frost action
sashaice [31]

Answer:

<h2>Frost is the decrease in air temperature to a value equal to or lower than the freezing point of water 0 ° C (WMO, 1992). The ice cover is one of its forms produced by the sublimation of water vapor on objects; it occurs when these temperatures are present (Ascaso and Casasls, 1986).</h2>

Explanation:

<h2>MEXICO ♥</h2>
3 0
2 years ago
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