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Veins have a much lower blood pressure than arteries. which of these prevents backflow of blood in veins? a. pressure applied by the heart b. one–way valves in veins c. thin muscular walls of veins
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What do we call an individual that has inherited two identical alleles for the same trait? a.homozygous b.heterozygous c.monozzygous
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All of these things can block a bronchus and cause collapse of a lung except
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Most sidewalks are made out of solid concrete sections. There are spaces between the sections. What...
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