stimulus is any change in the environment that can be sensed by an organism and causes a response. For example, if you touch something hot and quickly move your hand away, the sensation of heat is the stimulus that caused the response of moving your hand away. Stimuli can come from outside of the body, like seeing a bright light, or from inside the body, like feeling hungry. These signals help an organism detect and respond to changes in the environment, which is important for survival.

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