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AQUATIC ECOSYSTEMS
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A large natural stream of water flowing in a channel to the sea, a lake, or another river.
RIVER
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The natural environment where specific animals and plants usually live.
HABITAT
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Catching too many fish in an area of the sea
OVERFISHING
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Very small plants and animals that float on the surface of the sea
PLANKTON
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The ground under the sea; the ocean floor
SEABEDS
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