What is a flatworm? Evolution and Biology

By |2019-06-10T15:52:10-07:00May 26th, 2017|Biology|0 Comments

A flatworm When did flatworms evolve? The first flatworms, or platyhelminthes, probably evolved from something like a hydra about 550 million years ago. What's a hydra? Proterozoic Eon All our [...]