What is a brain? Biology and Evolution

By |2019-02-21T21:22:18-07:00May 26th, 2017|Biology|

This is a mouse brain When did the first brains evolve? 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. What is a [...]