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What is a brain? Biology and Evolution

By |2017-05-26T23:54:10+00:00May 26th, 2017|Biology|

This is a mouse brain Flatworms were the first animals to evolve anything like a brain, but it's really just a thickened part of the main nerve at one end of the flatworm. That was about 550 million years ago, in the Proterozoic period. The first real brains were in fish. That's probably [...]