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Marine biology is the scientific study of living organisms in the ocean or other marine or brackish bodies of water. Given that in biology many phyla, families and genera have some species that live in the sea and others that live on land, marine biology classifies species based on the environment rather than on taxonomy. Marine biology differs from marine ecology as marine ecology is focused on how organisms interact with each other and environment and biology is the study of the animal itself.


Marine life is a vast resource, providing food, medicine, and raw materials, in addition to helping to support recreation and tourism all over the world. At a fundamental level, marine life helps determine the very nature of our planet. Marine organisms contribute significantly to the oxygen cycle, and are involved in the regulation of the earth's climate. Shorelines are in part shaped and protected by marine life, and some marine organisms even help create new land.


Marine biology covers a great deal, from the microscopic, including most zooplankton and phytoplankton, where zooplankton can be as small as 0.02 micrometers or as big as 2 meters in the case of the sunfish to the huge cetaceans (whales) which reach up to a reported 48 meters (125 feet) in length.

From Wikipedia, the free encyclopedia