Which extra-embryonic membrane prevents the embryo from drying out in the uterus in humans?
- AChorion
- BAllantois
- CYolk sac
- DAmnion
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The figure below shows a human fetus within the uterus. Identify $P$ and $Q$.
$\quad\quad P \quad\quad\quad Q$
$\quad\quad P \quad\quad\quad Q$
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