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Newton's Third Law:
For every action there is an equal and opposite reaction.
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Action-reaction force pairs explain much of the locomotion in this world. In the case of a fish, there is the interaction between the fish's fins and the water. Like any interaction, it is a mutual interaction between two objects that results in equal forces on both objects directed in opposite directions.
To answer this question correctly, look for the pair of action-reaction interactions between fish fins and water. The action and reaction statements should involve these same two objects. And the interactions should be directed in opposite directions.
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