The correct answer is A
I am sure it is Oxygen
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Answer:
Cellular respiration is a key role in returning the muscles to normal after exercise, converting the excess pyruvate into ATP and regenerating the stores of ATP, phosphocreatine, and glycogen in the muscle that are required for more rapid contractions.
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Francis Crick who was a biologist was the one who discovered the structure of DNA in 1953
That thing would need to rely on some source of food to live. Plants are living and they rely on sun and water. Humans rely on calories.
