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In marine geology and biology, benthos are the organisms and habitats of the sea floor; in freshwater biology they are the organisms and habitats of the bottoms of lakes, rivers, and creeks.
From the size of organisms there are distinguished
- macrobenthos, size > 1 mm
- meiobenthos, size > 0.063 mm
- microbenthos, size <0.063 mm
Benthic organisms play a great role as food for fish and humans, but also as destruents.
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