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Marine biologists study and work with sea creatures in their natural environment, the oceans of the world and tidal pools along shorelines, as well as in laboratories. These scientists are interested in knowing how the ocean's changing conditions, such as temperature and chemical pollutants, can affect the plants and animals that live there. For example, what happens when certain species become extinct or are no longer safe to be eaten? Marine biologists can begin to understand how the world's food supply is diminished and help come up with solutions that can change such problem situations.