Throughout the descriptions of the various major animal taxa,the type of cleavage and the origin of the coelom are of foremost importance.Why are such esoteric developmental features central to classification compared to other prominent anatomical and physiological features that are only mentioned for a few major taxa?

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The Answer of Throughout the descriptions of the various major animal taxa,the type of cleavage and the origin of the coelom are of foremost importance.Why are such esoteric developmental features central to classification compared to other prominent anatomical and physiological features that are only mentioned for a few major taxa?

Throughout the Descriptions of the Various Major Animal Taxa,the Type