Science, asked by pg2060330, 4 months ago

जमीन के ऊपर badhne वाले भाग को मूलांकुर कहते हैं सत्य है सत्य बताओ​

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Answered by Anonymous
6

Answer:

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Answered by Anonymous
3

Answer:

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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