Variation within species was important to the development of Darwin’s theory of evolution. Which statement does individual variation help explain?

A.) Resources become limited over long periods of time
B.) Populations often increase rapidly and without warning
C.) Competition is fierce among members of different species
D.) Some organisms survive and reproduce better than others

google my dude. if it doesn't show up ask me.

answer; i believe the correct answer is (replication is not conservative);

these muscles maintain the blood pressure in the vessels. the smooth muscles are innervated by nerves of the autonomic nervous system. when the muscles contract, they cause vasoconstriction of the vessels and increase blood pressure. when the muscles relax, they enable vasodilation of the   blood vessels hence reduce blood pressure.