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Organisms on earth are what-based life forms oxygen hydrogen carbon
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Organisms on earth are
what-based life forms
oxygen
hydrogen
carbon

User Laugh
by
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2 Answers

2 votes
Oxygen. You need it to survive.
User Animesh Kumar Paul
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8.2k points
3 votes
I think that the answer is oxygen, oxygen plays a huge role in the evolution of organisms.
User PyNEwbie
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