A marine biologist is someone who works in some branch of marine biology. Given that around 70 percent of the Earth's surface is covered in oceans, you can imagine that marine biology is a very large field, encompassing everything from studies of ocean currents to analysis of the creatures who live next to hydrothermal vents. As a general rule, a marine biologist is passionate about and interested in some aspect of the ocean, and he or she usually works to study and preserve ocean life while also educating people about it.
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