Flatworms are the most primitive animal phylum to have:

Name: Flatworms are the most primitive animal phylum to have:
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Flatworms are the most primitive animals that have organs. They have simple organ systems, such as a digestive system, nervous system, and excretory system.

Answer: E
 Flatworms have muscle tissue that allow them to move and prey on other organisms. However, they do not have a well-developed circulatory system, and their level of symmetry varies among different groups.

Flatworms Are the Most Primitive Animal Phylum to Have