1. What social issues affected the problem or its solution in each of the stories?
2.How did economics delay scientists' first attempts for conservation in each story?

not sure if this what   you'r looking for would be percent composition

c is the correct answer hope this !

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

layer 3 is younger than layer 6.