Which is not a characteristic of populations? A. They are subject to limiting factors such as food supply and predators.
B. They grow and decline over time.
C. They interact with other populations in an ecosystem
D. They consist of all the species in a defined area.

D is not a characteristic of populations

Explanation:

Populations are one species in a defined area, not all.

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.