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the aggregate of small plant and animal organisms that float or drift in great numbers in fresh or salt water
network of complex interactions formed by the feeding relationships among the various organisms in an ecosystem
part of the shoreline that is underwater at high tide and exposed to the air at low tide
a device that bounces sound waves off underwater objects and then records the echoes of these sound waves
a gently sloping, shallow area of the ocean floor that extends outward from the edge of a continent
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