The solid mass of cells formed at the end of cleavage of a mammalian egg is:

The hormone that prepares and maintains the uterus during pregnancy is secreted by

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

Identify $A, B, C$ and $D$ in the figure given below.

The structure connecting the fetus to the placenta is:

In females,$LH$ stimulates . . . . . . in the ovary to secrete . . . . . . .