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What are neurons? Nervous system evolution and biology

By |2017-05-27T15:24:43+00:00May 27th, 2017|Biology|

A network of neurons One-celled creatures like bacteria don't have neurons, because they can communicate within themselves through the use of enzymes, but all multicellular animals do have neurons. The simplest and earliest example of neurons is in hydras, which evolved around 600 million years ago. In hydras, neurons are not organized into [...]

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 [...]