You need amino acids in your diet every day, since your body doesn't store excess amino acids consumed. If essential amino acids are missing from your diet, your body will start breaking down muscle tissue to access the amino acids that is contains so they can use them elsewhere.
Answer:
I know for a fact that Cellular Respiration releases carbon dioxide. I am guessing combustion (depending if natural or not) and volcanic eruption release carbon dioxide too.
Is C.... I hope this helps
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