All living members of the class Cyclostomata are :
Correct Answer :
Ectoparasite
Solution :
All living members of the class Cyclostomata are parasites that live on the outside of their hosts. By definition, an ectoparasite attaches to the external surface of a host and derives nutrients without entering the host’s body cavity. Since every known living Cyclostomata exhibits this mode of life, they are correctly classified as ectoparasites.
Thus, the answer is “Ectoparasite”.
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