The coral reef serves as a source of food and shelter for aquatic animals. Almost one fourth of the species present in ocean depends on coral reef for food and shelter. Coral reefs are often called as rainforest of the sea. They do not have only predatory relationship rather they have symbiotic relationship with aquatic organisms.
Decomposition dead organisms by fungi and bacteria remove sulfur groups from amino acids, producing hydrogen sulfide, returning inorganic sulfur to the environment.
