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the purpose of the system is to prevent foreign substances from entering the body and to attack foreign substances that are in the body.

a. nervous

b. immune

c. excretory

d. endocrine

answer: blah

explanation:

bc blah

the answer would be 2, if crossing over doesn’t occur 2 out of 4 of the daughter cells will have that allele.

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