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If I absolutely had to answer with two atoms, I'd say carbon and hydrogen. This is because carbon is the absolutely indispensible atom that is the absolute basis of all organic molecules, forms they're backbones, and it is carbon's ability to make multible chemical bonds that allows for complex molecular structures. Secondly, hydrogen because any time a carbon molecule has a free chemical bond (not bound to another carbon or some other atom), it bonds to hydrogen. Hydrocarbons are entirely carbon and hydrogen.

I must say however that for some organic molecules (e.g. carbohydrates) I would have to say there are three atoms which are the basis: carbon, hydrogen, and oxygen.

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15y ago

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