Mutations that neither benefit nor harm the organism have/ a positivea negative /an aggressive / a neutral / effect on the organism's survival.

Mutations that neither benefit nor harm the organism have a neutral effect on the organism's survival. This is called a neutral mutation or a silent mutation.

stimulus is a change in the environment that causes an organism to react. the response is the reaction to the stimulus. some examples of stimuli for zebras are drought, to many predators, and bad feeding grounds such as dead grass or plants. zebras respond to stimuli just like all other living organisms