Here's why:
* Stimulus: A stimulus is any change in the internal or external environment that can be detected by an organism. This change can be anything from a change in temperature, light, sound, touch, chemicals, or even internal factors like blood sugar levels.
* Response: The response is the reaction of the organism to the stimulus. It can be a physical reaction, like moving away from a hot stove, or a physiological reaction, like sweating when you're hot.
Example:
* Stimulus: The smell of food
* Response: Salivation and feelings of hunger
