A Trench in the Open Ocean Is 15,000 Feet Deep

Multiple Choice

A trench in the open ocean is 15,000 feet deep.It contains a thriving, diverse ecosystem of living organisms.This ecosystem is most likely possible because

A) very clear water allows light to penetrate and photosynthesis to occur.
B) a hydrothermal vent provides heat, and the heat stimulates photosynthesis.
C) a hydrothermal vent provides nutrients that are used by chemoautotrophic prokaryotes.
D) in some areas of the deep ocean, water pressure is much less, making life possible.
E) in some areas of the deep ocean, waves stir up nutrients that support the life.