The mitochandria's main function is to produce ATP through cellular respiration.
Answer: I believe it was Johann Wolfgang Dobereiner
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I think it just all exists at once, if it never is created or destroyed. It must have just appeared at the same time at some point. It doesn't exactly come from anywhere, but that's my opinion. There might be another scientific answer out there, but that's what i think. I hope this helps.
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