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This ancient sea creature may already have had a brain

Advanced 3D reconstructions of the comb jelly’s aboral organ reveal a sensory system far more complex than scientists expected. The organ contains a wide variety of specialized cells and is closely linked to the animal’s nerve network, allowing it to coordinate behavior and orientation in the water. Researchers say it may function as a primitive brain-like center. The discovery suggests that centralized nervous systems might have evolved independently in different animal lineages.

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