Archenteron is lined with
Ectoderm
Mesoderm
Endoderm
Mesoderm and endoderm
In humans, what is the ratio of the number of gametes produced from one male primary sex cell to the number of gametes produced from one female primary sex cell ?
In adults, length and width of testis is about.....repectively
In the embryonic development of chordate the animal pole forms one of the following of the adult
In mammals the female secondary sexual characters are developed by the hormone
Vaginal orifice, urethral orifice are open in