Medium· Phylum Chordata (Basic Features of Chordates)· +4 / −1
Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).
**Assertion (A):** All vertebrates are chordates but all chordates are not vertebrates.
**Reason (R):** Notochord is replaced by the vertebral column in the adult vertebrates.
In the light of the above statements, choose the correct answer from the options given below: