In which animal the testes are abdominal during embryonic stages but migrate to scrotum just before birth where they remain throughout life

In female mammals Bartholin's glands open into the

Which of the following structure is found in blastula

The concept that organiser is essential for embryonic development was given by or For the ‘Theory of organiser’, Nobel prize was given to

The nerve cells, brain and spinal cord or central nervous system develops from embryonic

Rapid secretion of $LH$ in ovulation causes