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A marine biologist is a scientist that studies the aquatic life. they find new species of marine life and track old and new species. They study salinity, temperature, acidity, light, oxygen content, and other physical conditions of water to stay close to the aquatic world. This includes studying tide waves and even seashells. A cool fact to know is that 99 per cent of living space on earth is the ocean. There is so much more to learn about the aquatic world and deep sea creatures down in the dark world of the ocean.