Coral Reef
A coral reef is an underwater ecosystem characterized by reef-building corals.
Reefs are formed of colonies of coral polyps held together by calcium carbonate.
Most coral reefs are built from stony corals, whose polyps cluster in groups.
A coral reef is an underwater ecosystem characterized by reef-building corals.
Reefs are formed of colonies of coral polyps held together by calcium carbonate.
Most coral reefs are built from stony corals, whose polyps cluster in groups.