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For one, oxygen and hydrogen mostly make up organic compounds (the one element you need for an organic compound NO MATTER WHAT, would be carbon). Organic compounds make up every living thing on earth, from tigers to cyanobacteria to mushrooms. That's why H and O are so common in animals. Now for the earth. Hydrogen is the most abundant element in the universe, for one. We also need oxygen to breathe and live. Cyanobacteria were the first organisms to produce oxygen, little interesting fact there.

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