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The placenta in humans is best described as:
Answer & Solution
Correct answer: B.
1. The placenta is a special tissue connecting the embryo to the uterine wall.
2. It carries villi that maximise surface area for exchange.
3. Nutrients and oxygen pass from mother to embryo; wastes pass back.
_Source: NCERT Class 10 Science, Ch 7 "How do Organisms Reproduce", §7.3.3_
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