Coral reefs are spectacular, diverse, ecosystems that are home to thousands of different species. Coral reefs have been termed ‘the rainforests of the sea’ because they support a vast abundance and diversity of different plants and animals, more species than any other marine ecosystem, with more still being discovered.

Coral reefs are threatened by fishing, climate change, and development, and are having trouble all around the world. With sufficient effort and political will, most of the direct impacts to coral reefs can be alleviated.  

Coral reefs are the largest structures that have been created by natural activity , as well as the oldest ecosystems .   Corals are small animals (polyps) that have tiny tentacles for the purpose of feeding from microscopic plankton , Each (polyp) lives behind a calcareous skeleton when they die . this elaborates coral reefs trough time .