Sea star aboral diagram
The madreporite / ˌ m æ d r ɪ ˈ p ɔːr aɪ t / is a lightcolored calcareous opening used to filter water into the water vascular system of echinoderms.It acts like a pressure-equalizing
valve. It is visible as a small red or yellow button-like structure, looking like a small wart, on the aboral surface of the central disk of a sea star.Close up, it is visibly structured, resembling a A deep-sea clam found in the North Atlantic takes up to 100 years to grow to a length of one centimeter. Marine life, or sea life or ocean life, is the plants, animals and other organisms that live in the salt water of the sea or ocean, or the brackish water of coastal estuaries.At a fundamental level, marine life affects the nature of the planet. Marine organisms produce oxygen. Shorelines are in part shaped and protected by marine life, and some marine organisms even help create new land. Academia.edu is a platform for academics to share research papers.