The alimentary canal of a frog is short because:

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:

The heart of a frog differs from that of a rabbit due to the presence of which of the following?

Select the correct option regarding the respiratory system of a frog:
$(1)$ The glottis is covered by a thin,elastic cartilaginous flap called the epiglottis.
$(2)$ Frogs respire through gills or moist skin.

In the circulatory system of a frog,which of the following vessels contains the most deoxygenated blood?

What is the difference between the bone of a rabbit and that of a frog?