Vanadium-containing blood pigment is noticed among

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 $(R):$ The members of subphylum Vertebrata possess a notochord during the embryonic period; the notochord is replaced by a cartilaginous or bony vertebral column in adults.
In the light of the above statements,choose the correct answer from the options given below:

Which of the following groups of animals have a closed circulatory system?

In vertebrates, the notochord is replaced by which structure during the embryonic stage?

In which of the following is the notochord extended from head to tail region and is persistent throughout their life?

$Peripatus$ is a connecting link between which of the following?