Which best explains why viruses do not have special structures or enzymes that allow them to make their own food?

Viruses lack the cellular machinery needed to obtain and use energy on their own, so they rely on the living cells they infect. This makes choice A, “Viruses can use energy of living cells that they infect,” the best explanation. Replicating inside a host is related to viral reproduction, but it does not explain their lack of food-making structures or enzymes.

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