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

question 190

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.

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