Bilaterian animals are divided into two monophyletic groups, the _____ and the _____, which are supported by patterns of comparative anatomy, comparative embryology, and molecular sequence data.

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The two monophyletic groups of bilaterian animals are Protostomia and Deuterostomia, which are based on patterns of comparative anatomy, comparative embryology, and molecular sequence data. Lophotrochozoa and Ecdysozoa also represent two distinct lineages of bilaterian animals, but they are not as widely accepted as Protostomia and Deuterostomia. Chordata and Hemichordata represent phyla within the Deuterostomia group. Eumetazoa and Protozoa are not bilaterian groups, but rather represent the distinction between animals that are multicellular and those that are unicellular.

Bilaterian Animals Are Divided into Two Monophyletic Groups, the _____