“Ecosystem for an estimated 25% of all marine species” crossword clue

Reveal the answer to see why it works and where this clue has appeared before.REEF is the answer to the New York Times crossword clue “Ecosystem for an estimated 25% of all marine species”. It was last seen in the puzzle of March 23, 2025, where it runs at 49 Down and fills 4 squares. It crosses 4 other entries in that grid — those are listed below and are the quickest way to confirm the letters you already have.