question: Organisms that live deep in the ocean must be able to withstand what?
distractor3: tsunamis
distractor1: the sun
distractor2: significant water pressure
correct_answer: extreme water pressure
support: Organisms that live deep in the ocean must be able to withstand extreme water pressure, very cold water, and complete darkness. However, even here, thriving communities of living things can be found. Organisms cluster around hydrothermal vents in the ocean floor. The vents release hot water containing chemicals that would be toxic to most other living things. The producers among them are single-celled chemoautotrophs. They make food using energy stored in the chemicals. The tube worms in this chapter's opening photo depend on these chemoautotrophs for food.