Corals are colonial marine invertebrates within the subphylum Anthozoa of the phylum Cnidaria. They typically form compact colonies of many identical individual polyps. Coral species include the …

May 22, 2026 · Coral, any of a variety of invertebrate marine organisms of the class Anthozoa that are characterized by skeletons—external or internal—of a stonelike, horny, or leathery consistency.

This tutorial is an overview of the biology of and threats to coral reefs, as well as efforts being made to conserve and protect them. It includes images, animations, and videos.

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CORAL definition: the hard, variously colored, calcareous skeleton secreted by certain marine polyps. See examples of coral used in a sentence.

Oct 15, 2024 · A coral reef is a term used to describe the collective structure of hard corals that help shape a coral reef ecosystem. “A coral reef is a reef whose main structure is made by living …

3 days ago · Though they can look like rocks or plants, corals are animals. Most are made up of colonies of individuals called polyps.

Nov 7, 2017 · What are coral reefs? Coral can be found in tropical ocean waters around the world. But how much do you know about reefs and the tiny animals—polyps—that build them?

Jun 1, 2026 · The meaning of CORAL is the calcareous or horny skeletal deposit produced by anthozoan or rarely hydrozoan polyps; especially : a richly red precious coral secreted by a …