Organisms can detect and respond quickly to changes in the environment. these responses are necessary in maintaining what?

irritability

Explanation:Response to stimuli is an important characteristic of life. Anything that causes a living organism to react is called a stimulus (plural is stimuli) Stimuli can be external or internal.

For instance, if you feel like going to the bathroom, it is an internal stimulus that is controlled by the brain. If the sun comes up on a warm day, it is an external stimulus that can cause a snake to come out and busk. The ability of the organism to react is called ‘irritability

the man is bald so he has no hair to get wet

sound moves fastest in solids because the molecules are tightly packed and it allows sound to vibrate