Which term means changes in the environment triggering responses?

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Stimuli are changes in the environment that trigger responses in an organism. They are signals detected by receptors, and when perceived, they prompt a reaction—like a touch causing withdrawal, a bright light causing eyes to blink, or a temperature drop prompting shivering. Instinctual behaviour refers to inherited patterns of response—not the triggering signal itself. Memory is the ability to store and recall information. Glandular secretions are substances produced by glands, such as oil or sweat, and are not the triggering changes. So the term that means changes in the environment triggering responses is stimuli.