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

Why the testes are situated in the scrotum, which is located outside the abdominal cavity ?

Which hormone is produced throughout the menstrual cycle?

$A$ : Development is the emergence of a multicellular organism from a single group of cells.
$R$ : Development involves growth, differentiation and morphogenesis.

Cells of leydig are found in

Cleavage divisions differ from normal mitotic divisions in that