Which of these make up the mass of an atom?

x would be the most and the least would be y because there are more fruit   and seeds than flock z has insects

i believe your answer would be c.. : )

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.