The aim of the paper is to investigate the characteristics of Porifera and Ctenophores in order to determine their phylogeny. Characteristics such as physiology, morphology and molecular genetics of these organisms is analyzed to map evolutionary relationships. Because these groups have not been studied extensively, making these relationships presents some difficulty. Studying them from the fossil record is a challenge because they are poorly preserved. Ctenophores are gelatinous and fragile, which makes them harder to collect. The wide diversity of porifera and ctenophores also makes them difficult to characterize. For example, ctenophores are found throughout the ocean from pole to pole. Though even with more information collected on the two species, they are often interpreted in the context of bilateria, which leads them to be labeled as less complex than they actually are. Despite the seemingly simple morphology of sponges, they have a similar genetic inventory to more complex animals. Even though the physiology of sponges is different, it carries out the same tasks and is just as complex.
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