Juan is studying a population of birds in the tropics. After he tags each individual, he measures the beak length, beak width, wing span, and weight
of each of the birds that he traps. What would be the best format (method)
to record this data?

the correct answer is d

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.