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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 are flatworms? Evolution and Biology

By |2018-04-16T08:26:45+00:00May 26th, 2017|Biology|

A flatworm The first flatworms, or platyhelminthes, probably evolved from something like a hydra about 550 million years ago. Like all other living things at this time, these early flatworms all lived in the ocean. A flatworm has a body shaped roughly like a bag, like the earlier hydras. Flatworms were the first [...]