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  • Coral polyps are tiny animals that build protective calcium carbonate skeletons.
  • Coral polyps create the basic structure of coral reefs with the help of single-celled algae.

Coral reefs can be seen from space, but they are made by one of the world's simplest animals - some no bigger than the head of a pin. They are able do this because of their symbiotic relation with single-celled algae.

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