Why are coral reefs refer to as ecosystems?
user
Coral reefs are huge, vibrant ecosystems -- they can cover hundreds of square miles.  They provide important habitat for a variety of species, and they are home to many organisms, from tiny plants and microbes to large fish and corals.
assistant
Why are coral reefs refer to as ecosystems?
user
Coral reefs are complex ecosystems with a huge variety of species. The coral provides habitat, and the corals themselves are home to numerous small organisms.  The water provides nutrients, and there are also lots of small fish and other animals that live in the reefs, and also in the water surrounding them.
assistant
Why are coral reefs refer to as ecosystems?