Question

what is the sources of energy deep in the oceans

Answer 1

Answer:

Even without sunlight, most life in the deep sea is still dependent on the sun. The dead organic matter on which these animals and bacteria feed ultimately comes from

phytoplankton

and other plants and organisms that harness sunlight to create energy in a process called photosynthesis.

... but not all of it

The discovery of hydrothermal vents and cold seeps shows that life can also exist independently of the sun. The unique communities here derive their energy from chemicals rather than sunlight.