What is formed during gastrulation?

What is the reproductive nature of humans?

Thalidomide is a non-barbiturate sedative drug which was given to pregnant women. Its use was withdrawn in $1961$ because it resulted in phocomelia. This condition illustrates:

Placenta acts as an endocrine tissue and produces several hormones like:
$A.$ Human chorionic gonadotropin $(hCG)$
$B.$ Human placental lactogen $(hPL)$
$C.$ Estrogens
$D.$ Progesterone

What is the correct sequence of events in the formation of an offspring from a zygote?

Where does the development of the zygote take place in viviparous organisms?