The blastopore is the ....................

The opening of the rectum in a frog is called:

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:

Which of the following structures open into the cloaca of a female frog?

Assertion: The heart of a frog is muscular and three-chambered.
Reason: The heart of a frog pumps mixed blood into the lungs and body via the $conus \ arteriosus$.

In male frogs,the ureter carries .......... .