Because they lack well-defined and complex organ systems, we hypothesize that _____ diverged from all other animals early in the evolution of animals.

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Poriferans, also known as sponges, lack the well-defined and complex organ systems found in other animal groups. Therefore, they are thought to have diverged from all other animals early in the evolution of animals. Choanoflagellates and bilaterians, on the other hand, do have well-defined organ systems and are more closely related to other animal groups.

Because They Lack Well-Defined and Complex Organ Systems, We Hypothesize