Consider the following four statements (A$$-$$D) related to the common frog Rana tigrina, and select the correct option starting which ones are true (T) and which ones are false (F). Statements:
A.  On dry land it would die due to lack of O₂ if its mouth is forcibly kept closed for a few days.
B.  It has four-chambered heart.
C.  On dry land it turns uricotelic from ureotelic.
D.  Its life-history is carried out in pond water.

Which one of the following statements is totally wrong about the occurrence of notochord, while the other three are correct?

Which one of the following groups of animals is correctly matched with its characteristic feature without any exception?

What will you look for to identify the sex of the following?