Hypothesis 1: Porifera is a monophyletic group Porifera is the sister-group to Eumetazoa Hexactinellida is more closely related to Calcarea Demospongea is equally closely related to both Hexactinellida and Calcarea. Hypothesis 2: Porifera is a paraphyletic group Calcarea is more closely related to Eumetazoa than Demospongea or Hexactinellida Hexactinellida is sister-group to the clade formed by Calcarea and Eumetazoa Hexactinellida is more closely related to Calcarea and Eumetazoa than to Demospongea

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Classification of Marine Organisms

Classification is a way of categorizing organisms that enables an easy process of identification of such organisms. All living things are classified by grouping them under specific categories. The grouping is done based on the close relativeness of the organisms. The classification tool requires knowledge of characteristics, differences, and similarities between different organisms.