which is needed for proper blood clotting.
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Explanation:
Platelet aggregation and fibrin formation both require the proteolytic enzyme thrombin. Clotting also requires: calcium ions (Ca2+)(which is why blood banks use a chelating agent to bind the calcium in donated blood so the blood will not clot in the bag). about a dozen other protein clotting factors.
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Answer:
vitamin k
Explanation:
vitamin k is needed for proper blood clotting
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