there is only one ocean . it is divided into five different parts the pacific,atlantic,antarctic,arctic oceans.there are also many other smaller seas,gulf and bay which form part of them .altogether they cover 75 percent of earth's surface.for centuries,people have been challenged by mysteries that lie beneath the ocean.however today's scientists have overcome many of the submarines to investigate the seabed and bring samples of marine life back to the surface for further study.satellite photographs provide a wide range of information including water temperature depth and undersea populations.if modern technology did not exist we would never have such precious informationmarine plants and animals fall into three major groups.some of them live on or depend on the bottom like the starfish.some are swimming animals such as fishes and sharks that move independently of water currents while others are tiny organism that are carried along by the currents like the jellyfish.plants and animals of the sea,however small or oversize all contribute to its biodiversity.unless this biodiversity were maintained marine life would be at stake
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