Which vein drains blood from the back region in a frog?

Forebrain of frog does not include which of the following structures?

Bidder's canal is found in

Which is the main respiratory organ in a frog?

Chromatophores in the skin of a frog are found in the stratum:

Which of the following statements are correct with respect to $Frogs$?
$A$. $Bidder's$ canals are present in male $Frogs$
$B$. Copulatory pads are present in female $Frogs$
$C$. Sound producing vocal sacs are present in male $Frogs$
$D$. $Cloaca$ is present in male $Frog$ only
Choose the most appropriate answer from the options given below: