Which of the following structure is lacking from the placenta
Arteries
Veins
Smooth muscles
Nerves
If the nuclei from an $8$-celled stage of an embryo are transplanted into enucleated eggs, which of the following events is likely to occur
Which of the following substances can pass through the placenta from the mother into foetus
Bartholin glands are situated
Graafian follicle contains
In a mesolecithal egg, one would expect