MCQ
It is structural and functional unit between developing embryo (Foetus) and maternal body
- ✓Placenta
- BYolksac
- CCavity of uterus
- DPlug
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| Gas | Atmospheric Air | Alveoli |
| $O_{2}$ | $159$ | $A$ |
| $CO _{2}$ | $0.3$ | $B$ |