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The energy used by cells comes from what? Molecules diffusing across the cell membrane. The synthesis of water molecules. Proteins produced in the ribosomes. The breakdown of food in the presence or absence
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The energy used by cells comes from what?

Molecules diffusing across the cell membrane.
The synthesis of water molecules.
Proteins produced in the ribosomes.
The breakdown of food in the presence or absence of oxygen.

User Tkarls
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The answer is most likely the last option.
User Huan Zhang
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