stomach

27 05, 2017

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 [...]

26 05, 2017

What does a stomach do? – Digestion and Evolution

By |2017-05-26T19:21:38-07:00May 26th, 2017|Biology|Comments Off on What does a stomach do? – Digestion and Evolution

Fish Stomach The first multi-cellular animals like hydras had no stomachs, or you could say they were all stomach, because they were shaped like a bag. Roundworms, a little later, [...]

Go to Top