Give the name of two hormones $A$ and $B$ in the figure given below
$FSH\; and \;GH$
$LH\; and and \;rogen$
$GH\; and\; LH$
$GH\; and\; lactin$
In mammals the female secondary sexual characters are developed by the hormone
Brain originates from which germ layer
Sperm lysins contains
Of the following animals which produces the smallest egg
Which one of the following is derived from ectoderm