What is an adaptation? O A. Away for an ecosystem to recover after a disturbance
O B. A genetic mutation that harms an organism
O C. A trait that makes an organism more likely to reproduce
O D. Something that an organism learns during its life

most community's take hundreds of years to become stable

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.