Crossword Genius

Underwater ecosystems (5)

Ross

I believe the answer is:

reefs

(Other definitions for reefs that I've seen before include "Submerged ridges of rock or coral near the surface of water" , "Ridges of rock or sand beneath sea surface" , "Groups of submerged rock" , "coral banks" .)

I've seen this clue in the USA Today, The New York Times and the LA Times.
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