The sinus venosus of the frog is located on

The $Y$-shaped bone is:

The ninth cranial nerve of a frog is

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 cloaca is.......

Match the description given in column $I$ with their examples given in column $II$ and choose the correct option.

Column $I$ (Description)	Column $II$ (Example)
$A$. Aquatic respiratory organ	$I$. Skin
$B$. Organ which acts as urogenital duct	$II$. Ureter and opens into the cloaca
$C$. $A$ small median chamber	$III$. Cloaca that is used to pass faecal matter,urine and sperms to the exterior
$D$. $A$ triangular structure	$IV$. Sinus venosus which joins the right atrium and receives blood through vena cava