Animal Kingdom-Quick Revision

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The animal kingdom is characterized by heterotrophic eukaryotic organisms that are multicellular and their cell lack cell wall. In animals, certain fundamental features are common to various individuals, which forms the basis of their classification. The level of organization also called grades of arrangement cellular level(Poriferans), tissue level (coelenterates and ctenophores), tissue organ level (Platyhelminthes) […]