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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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This is a scaffolding of protein fibers that us sell keep it shape in a cell division and cell movement
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The hypothesis that evolution occurs at an irregular rate through geologic time is known as: directional evolution directional equilibrium punctuated equilibrium punctuated evolution
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Living organisms respond to changes in environmental conditions such as tempatures . which series lists the correct order in which the body would respond to such a change
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What is mutation? why are mutations more serious when they occur in a sex cell?...
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