An ecosystem in darkness

If light is needed for photosynthesis, but does not penetrate to the depths of the ocean, how does a consumer in ocean darkness feed?
Explain how producers can exist in the dark depths of the ocean.
Explain the difference between photosynthetic organisms and chemosynthetic organisms.
What is the energy source for photosynthetic organisms? What is the waste product?
What is the energy source for chemosynthetic organisms? What is the waste product?





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