After spending years in the ocean, a mature salmon swims up its home river to return to its birthplace. This behavior is an example of

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Quizplus · Accepted Answer

This behavior is an example of an instinct, a genetically programmed behavior that is not learned but instead is inherited from previous generations. The instinct to return to their birthplace to spawn is a key behavior in the life cycle of many species of salmon.

After Spending Years in the Ocean, a Mature Salmon Swims