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When you run, you begin to breathe heavier and faster. your heart beats more quickly, bringing more oxygen to your cells. which organ systems are working together here?
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Chloroplasts and bacteria are in size. a. similar b. at different ends of the size range c. exactly the same d. none of these
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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. oneβway valves in veins c. thin muscular walls of veins
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Populations can fluctuate which means go and go ....
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