Find out the statement which is true about the group-Gnathostomata. (A) It comprises of four cla...

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Find out the statement which is true about the group-Gnathostomata.
(A) It comprises of four classes
(B) They use hindlimbs for locomotion
(C) This group has organisms having an internal ear with two semicircular canals
(D) The animals of this group have paired appendages and paired nares
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