A stimulus is the agent that directly influences the activity of a living organism or one of its parts of living protoplasm. It is a change in surroundings of an organism that causes the organism to change its behavior. This, in turn makes the environment more satisfactory. Some animals migrate seasonally, and navigating to a specific site requires a mental cap and an ability to determine the correct direction and the movement of the organisms occur.

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Chapter 43, Problem 12SQ

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Concept introduction: A stimulus is the agent that directly influences the activity of a living organism or one of its parts of living protoplasm. It is a change in surroundings of an organism that causes the organism to change its behavior. This, in turn makes the environment more satisfactory. Some animals migrate seasonally, and navigating to a specific site requires a mental cap and an ability to determine the correct direction and the movement of the organisms occur.

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