The amnion and chorion consist of which type of composition?

Match the items $A, B, C, D$ of table $'A'$ with the items in table $'B'$. Then,the correct pairing sequence of $A, B, C, D$ will be:
Table $'A'$ | Table $'B'$
$A.$ Cleavage | $1.$ Formation of $3$ germ layers
$B.$ Gastrulation | $2.$ Formation of embryo spinal cord
$C.$ Neurulation | $3.$ Results in formation of skeleton and muscles from mesoderm
$D.$ Organogenesis | $4.$ Pattern depends on the amount and distribution of yolk

Foetal sex can be determined by examining cells from amniotic fluid by looking for:

Identify the structure shown in the process of human embryonic development.

Which is not the function of placenta?

The process of cell differentiation begins and ends in which of the following stages?