In a paper titled “Broadening the Definition of a Nervous System to Better Understand the Evolution of Plants and Animals,” Llinás and Sergio Miguel-Tomé, a colleague at the University of Salamanca, basically argue that it makes no sense to define a nervous system as something only animals can have rather than defining it as a physiological system that could be present in other organisms in a different form. Defining it phylogenetically—meaning assigning it only to one portion of the tree of life—ignores the very real force of convergent evolution, where organisms separately evolved similar
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