Which of the following is a correct statement about macarthur and wilson's island equilibrium model?
small islands receive few new immigrant species.
as the number of species on an island increases, the emigration rate decreases.
competitive exclusion is less likely on an island that has large numbers of species.
islands closer to the mainland have higher extinction rates.

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explanation:

i still can't find this

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.