In Human beings, at the end of $12$ weeks (first trimester) of pregnancy, the following is observed
Movement of the foetus
Eyelids and eyelashes are formed
Most of the major organ systems are formed
The head is covered with fine hair
Placenta produced which hormone
Foetus is nourished by
It is structural and functional unit between developing embryo (Foetus) and maternal body
The persistence of corpus luteum during pregnancy is due to a hormone known as
Several hormones like $hCG, hPL$, estrogen, progesterone are produced by