The way an organism reacts to a stimulus often results in a response.

Here's a breakdown:

* Stimulus: A change in the environment that can be detected by an organism. This could be light, sound, temperature, touch, or even internal changes like hunger or thirst.

* Response: The organism's reaction to the stimulus. This can be a simple action, like moving away from a hot object, or a complex behavior, like building a nest or communicating with others.

So, the relationship between stimulus and response is fundamental to how organisms interact with their environment and survive.