The $Swammerdam$ gland is associated with which of the following?

The renal portal system is made of

Provide definitions/explanations for the following terms:
$(i)$ Tadpole
$(ii)$ Urinogenital duct

Chordae tendinae in the heart of a frog are found in the wall of:

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

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.