Which of the following is present as an excretory organ in hagfish?

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

Which one of the following pairs of animals comprises 'jawless fishes'?

Which of the following characteristics does not apply to a hagfish?

Which of the following are animals belonging to the class $Cyclostomata$?

Lamprey is