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.

Question

Quizplus · Accepted Answer

The main reason for a thriving, diverse ecosystem in a deep ocean trench is the presence of hydrothermal vents that provide nutrients for chemoautotrophic prokaryotes, which form the base of the food chain. These vents release minerals and gases that support a unique ecosystem that is independent of sunlight. The water in deep ocean trenches is usually very clear, but it does not contain enough sunlight for photosynthesis by plants or algae to be a significant source of energy. The pressure in deep ocean trenches is high, which makes life challenging for most organisms. Waves do not penetrate to the depths of the trench, so they cannot stir up nutrients.

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