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Answer. Answer: the woman was reluctant to cross the street by herself because, 1)the road was slippery because of the snow.
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Unlike arteries, veins contain valves that ensure blood flows in only one direction. But, Arteries don't require valves because pressure from the heart is so strong that blood is only able to flow in one direction. Valves also help blood travel back to the heart against the force of gravity
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