In the first phase of gastrulation of amphibians there occurs the separation of
Ectoderm
Mesoderm
Endoderm
Mesoectoderm
It's Obvious
$A$ : The male urethra is longer than the female urethra. $R$ : It carries both urine as well as semen.
Survival time of sperms introduced into the vagina may be
$A$ : Leydig’s cells synthesise and secrete testicular hormones called androgens. $R$ : Leydig’s cells are located between the Sertoli cells.
The literal meaning of “gastrulation” is
Holoblastic cleavage may occur in eggs which are
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