How many of the following hormones are produced by the placenta?
Estrogen,Progesterone,Relaxin,$hCG$,$hPL$

$A$ post-gastrula embryo contains:

In the human uterus,the period of maximum and minimum fetal growth occurs in which months,respectively?

Placenta has an outer layer which is selectively permeable and hormone secreting which is known as

After one month of pregnancy,the embryo's $A$ is formed. By the end of the $B$ month of pregnancy,the foetus develops limbs and digits. By the end of $C$,most of the major organ systems are formed,for example,the limbs and external genital organs are well-developed. By the end of $D$,the body is covered with fine hair,eyelids separate,and eyelashes are formed. Here $A$ and $D$ refer to:

Identify $A$ to $D$ in the given figure.