What are flatworms? Evolution and Biology

By |2018-04-16T08:26:45-07:00May 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 [...]