Here's a breakdown:
* Stimulus: Any change in the environment that triggers a response in an organism. This could be something like a loud noise, a change in temperature, or the presence of food.
* Response: The organism's reaction to the stimulus. This can be a physical action (like moving away from danger), a physiological change (like sweating in heat), or a behavioral change (like hunting for food).
Example:
* Stimulus: A fly landing on your arm.
* Response: You swat the fly away.
Key point: Responses are the result of an organism interacting with its environment and are essential for survival.
