Is the great barrier reef largest living thing in world?

The Great Barrier Reef is not a single living thing, but rather a complex ecosystem made up of countless individual organisms. It is composed of over 2900 individual reefs and 900 islands. The organisms that make up the reef include corals, fish, mollusks, crustaceans, and other marine life. Corals are small, colonial animals that secrete a hard skeleton. Over time, these skeletons accumulate to form large coral reefs. The Great Barrier Reef is the largest coral reef system in the world, stretching for over 1400 miles along the coast of Queensland, Australia.