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Porque las aves y el hombre presentan sistema circulatorio cerrado doble completo
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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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Porque las aves y el hombre presentan sistema circulatorio cerrado doble completo...
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