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Impacts of the Ocean Temperatures and Acidification on Coral Reefs Coral reefs are not what many think they are. What typically comes to mind would be the beautiful, colorful rocks lying underneath the ocean. The reality is that the colorful hard rock is the skeleton of a creature living inside and these creatures are called polyps. (Barnes, R.D., 1987) They are static and do not move at all. They anchor themselves and secrete Calcium Carbonate. Polyps can grow in groups and in solitary. The colors come in symbiotic algae that live inside polyps and as they grow and die, coral build on top of them. As the years pass by the coral build on top of each other and grow into giant coral reefs, that create the basis for 25% of all ocean life. There are millions of species that depend on coral reefs and organisms that evolved to live around coral reefs. They also, control how much carbon dioxide is in the ocean. Like previously mentioned, the skeleton is made out of calcium carbonate. (NOAA 2014) They take out the carbon dioxide in the water and use it to build their skeletons. They trap CO2 in the stone, so it