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The first organisms on Earth were able to transform the carbon dioxide in the air into what essential element needed for modern life? A. Hydrogen B. Helium C. Nitrogen D. Oxygen
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The first organisms on Earth were able to transform the carbon dioxide in the air into what essential element needed for modern life?

A. Hydrogen

B. Helium

C. Nitrogen

D. Oxygen

User Xoid
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2 Answers

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D.) Oxygen, most mammals need good ol' Oxygen in order to turn glucose into energy. 
User Balupton
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1 vote
D. Oxygen
We wouldn't be here without it
User Rockhammer
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