The folds and groves on its surface give this #coral its name: “brain coral.” #Brain coral reproduce by developing both eggs and sperm in each polyp. There are thousands of different coral #species but only three main types of coral reefs: fringing, barrier, and atoll. #Coralreefs are the largest biological structure on #Earth and home to scores of marine #organisms, but they face significant #health threats from #human activities such as dynamite and cyanide #fishing, poor wastewater management, #climatechange, and runoff from construction or deforestation. #PhotoOfTheDay #science #ocean #marinebiology #life 📷 NOAA