Science 10 points

1. fill in the blanks:
shape a region's climate, and the earth can be divided into many climatic . every place in a particular climatic region will experience temperatures and precipitation.

c is the answer to this question. altitude affects the weather because air molecules evaporate.

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.