In the human body, muscle cells have an increased need for energy during excercise. to supply this energy the body will immediately increase

There are alot of things that will increase.

Explanation:

You could say, heart rate, or breathing. Or just increase in cellular respiration.

silty loam

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unicellular organisms, like bacteria, are able to perform all life functions within one single cell. multicellular organisms need many different types of cells to carry out the same life processes. each of these special types of cells has a different structure that it perform a specific function.