The cost to society due to air pollution from a manufacturing unit might be low. however, the same cost might be high for the natural habitat in and around the unit’s vicinity. what could account for this difference in costs?

genetic variation will increase because of a new habitat and food source.

explanation:

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.