One of the most important branch points in the evolution of animals and their nervous systems was the appearance of

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Bilateral symmetry allowed for the development of a centralized nervous system with a clear division of sensory and motor functions along the anterior-posterior axis. This led to the evolution of the brain and the development of more complex behaviors. Specialized cells for transmitting signals (i.e. neurons) also played a crucial role in this process, but their appearance was not a branch point in the same way that the evolution of bilateral symmetry was.

One of the Most Important Branch Points in the Evolution