How many classes are present in Gnathostomata | vedclass

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(C) The subphylum Vertebrata is divided into two divisions: Agnatha (jawless) and Gnathostomata (jawed).The division Gnathostomata is further divided

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$6$

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(C) The subphylum Vertebrata is divided into two divisions: Agnatha (jawless) and Gnathostomata (jawed).The division Gnathostomata is further divided into two superclasses: Pisces and Tetrapoda.$1$. Pisces includes two classes: Chondrichthyes and Osteichthyes.$2$. Tetrapoda includes four classes: Amphibia,Reptilia,Aves,and Mammalia.Therefore,there are a total of $2 + 4 = 6$ classes in Gnathostomata.

Column-$I$	Column-$II$
$A$. Planula	$1$. Coelenterata
$B$. Tornaria	$2$. Hemichordata
$C$. Trochophore	$3$. Annelida
$D$. Bipinnaria	$4$. Echinodermata
$E$. Glochidium	$5$. Mollusca

How many classes are present in Gnathostomata?

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