Water pollution is the contamination of lakes, streams, bays, underground water, or oceans by substances harmful to living things. All organisms contain and need water. Some live in it and most drink it. Plants and animals require water that is mostly pure, and they cannot survive if their water is loaded with toxic chemicals or harmful microorganisms. Water pollution can kill large numbers of plants, fish, birds, and other animals. Pollution makes streams, lakes, and coastal waters unpleasant to look at, to smell, a
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