In the frog,the ventricle opens into a sac-like conus arteriosus on the $......$ of the heart. Read the given statement and fill in the blank with the correct option from the given below.

Which of these is an ear ossicle in a frog?

In frogs,which system$(s)$ open into the cloaca?

Consider the following four statements $(A-D)$ related to the common frog $Rana$ $tigrina$, and select the correct option stating which ones are true $(T)$ and which ones are false $(F)$.
Statements:
$A.$ On dry land, it would die due to lack of $O_2$ if its mouth is forcibly kept closed for a few days.
$B.$ It has a four-chambered heart.
$C.$ On dry land, it turns uricotelic from ureotelic.
$D.$ Its life-history is carried out in pond water.

In frogs,the oviduct is formed by:

$A$: In frogs,the skin acts as a respiratory organ.
$R$: The skin of a frog is moist,slimy,and lacks an exoskeleton.