The correct option is C Excretion - uricotelic
An adult frog excretes urea and hence adult frogs are ureotelic. The tadpole of a frog is ammonotelic in nature.
The frog's heart is composed of three chambers which includes, two atria and one ventricle.
Unlike human beings, frogs have only 10 pairs of cranial nerves. Hypoglossal and accessory cranial nerves are absent in case of frogs.
Since blood flows through closed channels (blood vessels), the frogs have a closed vascular system.