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प्रश्न
The ______ have thin and less muscular ______ and have ______ to prevent back flow of ______.
रिकाम्या जागा भरा
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उत्तर
The veins have thin and less muscular thin pocket-shaped walls and have valves to prevent back flow of blood.
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या प्रश्नात किंवा उत्तरात काही त्रुटी आहे का?
