What is the polyp that can form important underwater habitats?

Coral polyps are small, soft-bodied organisms that are key components of coral reefs, which form important underwater habitats. These polyps secrete calcium carbonate to create the hard structure of coral reefs, providing shelter and resources for a diverse range of marine life. Coral reefs support biodiversity, protect Coastlines from erosion, and are vital for the health of ocean ecosystems.