Question

The structure which helps fish to swim in water​

Answer 1

Fish use their back fin, called the caudal fin, to help push them through the water.

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Answer 2

Answer:

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Explanation:

Fish swim by flexing their bodies and tail back and forth. Fish stretch or expand their muscles on one side of their body, while relaxing the muscles on the other side. This motion moves them forward through the water. Fish use their back fin, called the caudal fin, to help push them through the water.