Jawless vertebrates are placed in the group .........

What do animals of the class Cyclostomata possess at the anterior end of their mouth?

Which of the following is not a class of $Tetrapoda$?

Which of the following animals are ectoparasites on fish in their adult stage?

Ancestors of cyclostomes are

Statement $- I :-$ All living members of class $Cyclostomata$ are ectoparasites on some fishes.
Statement $- II :-$ $Cyclostomata$ have a sucking and circular mouth without jaws.