I am an animal that builds cities. I look like a plant and move like a rock. My city is home to a quarter of all ocean species. What am I?

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Accepted Answer

Coral. Coral is an animal — a tiny polyp that builds a hard calcium carbonate skeleton. Coral reefs, built by billions of polyps over centuries, cover less than 1% of the ocean floor but support about 25% of all marine species.

"I am an animal that builds cities. I look like a plant and move like a rock. My city is home to a quarter of all ocean species. What am I?"

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