Any action or agent that causes or changes an activity in an organism can be defined as

Reflex

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Impulse

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Coordination

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Stimulus

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Solution

The correct option is C Stimulus
Stimulus is something that causes a reaction. Anything that may have an impact or influence on a system. Something external that elicits a physiological or psychological activity or response. Anything that induces a person to take action.
Therefore, the correct answer is option D.

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Force is defined as a ___ or ____ that can cause an object to move, remain in place or change its shape.

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