Question

organisms at the bottom of the ocean have entire food webs that do not require energy from the sun. which process is most likely providing energy to these ecosystems?
chemosynthesis
oxidation

Explanation:

Chemosynthesis is a process by which certain organisms use chemical energy to produce organic compounds instead of sunlight - based photosynthesis. In deep - ocean ecosystems where sunlight is absent, chemosynthetic bacteria use chemicals like hydrogen sulfide to create energy for the food web. Oxidation is a general chemical process and not the main energy - providing process for these unique ecosystems.

Answer:

Chemosynthesis