True: Earth is called the "Blue planet", The earth is covered by water on its 75%, We need water from the ocean to oxygen the earth, Mussels filter seawater and improve its quality, Overfishing is a problem, False: Earth is called the "Thirsty planet", The earth is covered by water on its 50%, We need water from the ocean to cool the air, Snails filter seawater and improve its quality, There are endless fish in the ocean we can catch and eat,

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