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Fish often swim in groups called shoals. One reason they do this is for protection.
Many fish together can confuse a predator. This makes it hard for the predator to single out a fish.
Physical characteristics
They come in many diff erent shapes and sizes, but most are covered in scales and have strong fins for swimming.
A fish’s scales all lie in the same direction to help the fish slip through water. Like us, fish need oxygen to live.
Water enters the mouth and is swept over the gills. The oxygen passes from the water into tiny blood vessels in the gills.
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