Which of the following is a jawless class?

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(C) The class $Cyclostomata$ consists of organisms that are characterized by the absence of jaws. These are primitive vertebrates that have a sucking

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Cyclostomata

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(C) The class $Cyclostomata$ consists of organisms that are characterized by the absence of jaws. These are primitive vertebrates that have a sucking and circular mouth,hence the name $Cyclostomata$ (cyclo = circular,stomata = mouth). Other classes like $Pisces$,$Amphibia$,and $Mammalia$ belong to the superclass $Gnathostomata$,which are defined by the presence of jaws.

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