What are the two ways that organisms on the bottom of deep sea food chains acquire energy?

Organisms at the bottom of deep-sea food chains can obtain energy from chemosynthesis, in which microbes use chemical reactions to make food, and from marine snow, the dead organisms and other organic material that sink from upper waters. Photosynthesis is not a direct energy source on the dark ocean floor because sunlight does not reach it. The correct choice is “chemosynthesis and marine snow.”

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