Flatworms have no coelom. Recent gene sequencing shows that their closest relatives are the rotifers and gastrotrichs (which are pseudocoelomate), the bryozoans (which are coelomate), and the entoprocts (which are acoelomate). Which of the following is a legitimate conclusion? Flatworms, rotifers, and gastrotrichs form a monophyletic group. Flatworms and bryozoans form a monophyletic group. Flatworms and entoprocts form a monophyletic group. Bryozoans, rotifers, and gastrotrichs form a monophyletic group. There must be flaws in the gene sequence analyses.

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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.