1. Because that shows that you're a living thing because all living things can respond to stimuli. 2. Because an example of stimuli is a virus. If you couldn't respond to it (by fighting against it) you would probably die.
The stimuli are captured by the sensory system receptors through electrical impulses, being translated by the central nervous system (CNS) into sensations and generating responses.
Thanks to the stimuli, we can react to the cold or heat on our skin, see the things and colors around us, taste and smell foods and hear and interpret sounds.
The sensory system, responding to stimuli, maintains the functioning of the five senses, in addition to controlling the immune system, the organs and the functioning of the other systems of our body.
