The amnion and chorion consist of which type of composition?

Major features of embryonic development at various months of pregnancy are given below. Choose the correct option for the correct sequential events.
$(i)$ The first movements of the foetus
$(II)$ The foetus develops limbs and digits
$(III)$ The embryo's heart is formed
$(IV)$ The body is covered with fine hairs

All extra-embryonic membranes:

Which of the following statements is correct regarding the morula in humans?

Identify the odd one out among the hormones produced only during pregnancy.

The placenta helps in the maintenance of pregnancy by secreting a hormone,known as