Nutrients in coral reefs are extremely limited, which is why productivity lower than the deep ocean so plentiful that there is no limit to phytoplankton growth largely trapped below the pycnocline recycled efficiently because the water is shallow

Nutrients in coral reefs are recycling efficiently because the water is so shallow. Coral reefs are generally located along tropical coastlines, in open ocean deserts. They thrive in tropical, low nutrient waters because there is no phytoplankton in there. They are home to a large number of species, 

The offspring will be blood type aa, bb, ab and oo or i