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Practice #15,260
Q
मानव शरीर में पल रहे भ्रूण को ऑक्सीजन तथा पोषण की आपूर्ति एवं कार्बन-डाइऑक्साइड तथा भ्रूण द्वारा उत्सर्जी अवशिष्ट पदार्थों को बाहर निकालने का कार्य करता है-
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