What are segmented worms? Annelids, evolution, and biology

By |2019-01-27T20:52:49-08:00May 27th, 2017|Biology|2 Comments

An annelid, or segmented worm When did annelids evolve? Roundworms probably evolved into segmented worms, or annelids, about 545 million years ago. What's a roundworm? More about the Proterozoic All our [...]