(D) $Ctenophora$ is a small phylum of marine animals,which are commonly known as comb jellies or sea walnuts.These animals possess eight external rows

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(D) $Ctenophora$ is a small phylum of marine animals,which are commonly known as comb jellies or sea walnuts.These animals possess eight external rows of ciliated comb plates,which help in locomotion.The name $Ctenophora$ is derived from two Greek words: $ctenos$ = comb and $phora$ = bearing.