: secrete mucus that protect organs
: secretes enzymes that aid in digestion
: secrete tears
: keep the skin hydrated and soft

goblet cells: secrete mucus that protect organs

pancreas: secretes enzymes that aid in digestion

lacrimal glands: secrete tears

oil glands: keep the skin hydrated and soft

answer; i believe the answer is (polygenic inheritance;

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