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Have you ever wondered how, outside of the trash like plastic or wastewater that may sadly end up there, the seas remain so pure？ If you guessed that it is the amazing sea ecosystems that keep the oceanic environments so beautiful, you are right! It is known that there are more than one billion microbes in a liter of seawater. Some animals, such as sponges, clams, oysters, and mussels, keep the ocean pure by continuously filtering the water. A cleaner wrasse works about four hours a day and can clean more than 2000 “customers” daily!