People in developed countries tend to have a larger ecological footprint then people in developing countries

That they do. From things like vehicles, to factory production and output of smog, to more need for resources such as trees and coal and oil. They have more and want more which affects the ecosystem way more than countries still trying to find their footing.

the answer is b. glad to .

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