How do veins return blood to the heart? check all that are correct. rev: 01_08_2018_qc_113189 veins have one-way valves that prevent backflow in the limbs. the contraction of skeletal muscles push the blood in veins back toward the heart. the skeletal muscle pump involves the automatic contraction of the smooth muscles in the walls of the veins. the pressure from the arteries is sufficient to push the blood through the veins and back to the heart?
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Biology, 22.06.2019 07:50
Which of the following types of stars is most likely to end up as a supernova? in graph a, the curve peaks at 800 nm, in the red section of the visible light spectrum. in graph b, the curve peaks at 550 nm, in the green section of the visible light spectrum. in graph c, the curve peaks at 450 nm, in the blue section of the visible light spectrum. in graph d, the curve peaks at 300 nm, in the violet section of the visible light spectrum. a b c d
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Biology, 22.06.2019 16:30
9. technology can bring both good and bad things. building a vertical farm can increase food supplies in cities (good), but it may cause unemployment in rural areas (bad). give another example of both the good and bad sides of a technological advancement (5 noints)
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How do veins return blood to the heart? check all that are correct. rev: 01_08_2018_qc_113189 vein...
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