The mammalian primitive streak gives rise to

The lens of the eye is derived from which germ layer?

When does a foetus develop limbs and digits?

The minimum number of barriers present between foetal and maternal blood is present in which type of placenta?

The cavity of the gastrula is called

Select the mismatched pair:
$A$. First month of pregnancy - Formation of heart
$B$. Second month of pregnancy - Movement of foetus
$C$. Third month of pregnancy - Formation of most of the major organ systems
$D$. Sixth month of pregnancy - Eye lids separate and eye lashes are formed