Question

All living members of the class Cyclostomata are ______.

Options

• Free living

• Endoparasite

• Symbiotic

• Ectoparasite

Answer 1

All living members of the class Cyclostomata are ectoparasites.

Explanation:

Every member of the class who is still alive. On certain fish, cyclostomata are ectoparasites. They breathe through six to fifteen pairs of gill holes on their elongated bodies. Cyclostomes lack jaws and have a round, sucking mouth. They have paired fins and no scales on their body.