What makes up the Bairrier reef?

The Great Barrier Reef is primarily composed of coral polyps, tiny marine animals that secrete calcium carbonate to form hard coral structures. This vast ecosystem includes diverse habitats such as coral reefs, seagrass beds, and mangroves, supporting a wide variety of marine life. Additionally, the reef is home to over 1,500 species of fish, numerous invertebrates, and various types of marine plants. The combination of these elements creates one of the most complex and biodiverse ecosystems on the planet.