Each epididymis consists of a single tightly coiled tube whose length is about
$20\,cm$
$20\,feet$
$20\,metres$
None of these
In the ovum of rabbit, graafian follicle is
Blood flowing in umbilical cord is
Survival time of sperms introduced into the vagina may be
Graafian follicle contains
In embryonic stage RBC develops in