As the ocean gets deeper, it gets darker, colder, and less oxygen is available. Organisms that inhabit the aphotic zone and the deep-sea ecosystems within the aphotic zone have anomalous adaptations that help them survive in these difficult environments. Some organisms have such a large mouth that they can catch nutrients that fall from the depths of shallow waters. Others are adapting to obtain energy by chemically synthesizing chemicals from hydrothermal vents.
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