Our Origins

Glossary

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Glossary Terms for letter: V

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vasoconstriction The decrease in blood vessels' diameter due to the action of a nerve or of a drug; it can also occur in response to cold temperatures.

vasodilation The increase in blood vessels' diameter due to the action of a nerve or of a drug; it can also occur in response to hot temperatures.

victoriapithecids Miocene primates from Africa, possibly ancestral to Old World Monkeys.

visual predation hypothesis The proposition that unique primate traits arose as adaptations to preying on insects and on small animals.

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