What happens when frozen ice crystals accumulate by contact with other ice crystals? A) rain
B) hail
C) fog
D) snow

D snow

Explanation:

Because I took the test and got it right

and after water is usually warmed by the sun the water temperature raises and then evaporates .

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.