Which system is found in a baboon but not in a flatworm?

Baboons possess a complex nervous system, including a well-developed brain and a spinal cord, which allows for advanced sensory processing and motor control. In contrast, flatworms have a simpler nervous system, characterized by a nerve net and a pair of nerve cords, lacking the centralized structures found in higher animals like baboons. This difference illustrates the evolutionary complexity and adaptations of vertebrates compared to invertebrates.