The kidney of an adult frog is:

Assertion: Indirect development is present in frogs.
Reason: The larva of a frog undergoes metamorphosis to form the adult.

Choose the correct sentences for a female frog.
$1$. Vocal sacs are absent in female frogs.
$2$. $A$ mature female can lay $2500$ to $3000$ ova at a time.
$3$. In female frogs,fertilized eggs are encased in oothecae and it is a dark reddish to blackish brown.

Which of these is an ear ossicle in a frog?

Which of the following is absent in a frog?

Mesorchium in frog refers to