The occurrence of large or small beak sizes among seed crackers in the absence of medium sized beaks is an example of

the answer is a) cell division.

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the answer is c.

by: nicholas dooley

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.