Marine Ecosystems:
All of the photosynthetic activity of
the ocean occurs in the shallow water called the euphotic zone, either by
attached algae near the shore or by minute phytoplankton in the upper levels of
the open ocean. Consumers are either free-swimming pelagic organisms or
benthic organisms that live on the bottom. Small animals that feed on
phytoplankton are known as zooplankton.
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