Coral reefs, life concentrator, catalyst of biodiversity. How many different organisms live on this potato? 100, 200, 300? What you see at the scale of this small structure is also at the scale of an entire reef. Coral reefs are essential for healthy seas and oceans. They account for almost 20% of underwater biodiversity, but they represent less than 0.1% of the ocean area. Protecting them is an absolute necessity !!!