brain coral so called due to their generally spheroid and grooved surface

brain brown calcium called carbonate class clear cnidaria contributing coral corals ecosystem environment exhibits fish floor flora flower folds found generally grooved habitat habitats hard hue human identified illustrating intricate invertebrate jellyfish largest life lifespan lighter marine ocean oceans organism phylum present protection providing reef reefs resembling rests reveals rich ridges sea shallow shape skeleton species spheroid surface surrounded thrives underwater warm water worlds years