Awildlife researcher weighed all the raccoons that were trapped in suburban neighborhoods before they were released back into the wild. the researcher used this data to conclude that the raccoons in the state were getting heavier.
what error did the researcher make?

the answer is c. altitude. hope this ! #brainiac

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.  

answeran archaean