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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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Which of the following terms describes all of the non-living components of an ecosystem
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Color blindness is a recessive trait. the gene for color blindness is on the x chromosome. the family tree below shows the traits of color blindness. the only unknown is the father in the generation.
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During which period did the first vascular plants appear? a. cambrian b. ordovician c. silurian d....
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