From which embryonic structure develops the vertebral column
Neural canal
Archenteron
Notochord
Blastocoel
Give scientific reasons : When male excites sexually epididymis wall shrinks / contracts.
Nervous system in vertebrates develops from
Blood flowing in umbilical cord is
Rapid secretion of $LH$ in ovulation causes
The female structures that corresponds (homologous) to the scrotum of the male are