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There are some fish who are round and slow moving whereas streamlined fish can move fast as well as run from their predator.

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Aquatic animals such as seals and turtles have flipper to move easily in water.

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Some aquatic animals donot have fins.
Frogs, toads and water birds such as penguins have webbed feet to move easily in water.

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Swim bladder of some fish help them float when they are not swimming.
Some fish have oil stored which help them to float.

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They help fish to float in the water.

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Many fishes have streamlined bodies.
bodies has a narrow pointed head and end while the middle is broad.
It helps to reduce friction and helps the fish to move easily.