Answer:
becuase we survive evry bit were on earth ?
Explanation:
The answer is B: fat gives your body energy to function, while muscle mass is used only to perform strenuous activity. This option is only correct because the statement includes the words, "muscle mass." If it was only "muscle," then it would be wrong.
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Explanation: I USE IT!!
The alveoli are the tiny sacs through which oxygen and carbon dioxide pass in and out of the bloodstream.
