segmented worms

/Tag: segmented worms

What is silk? Ancient Chinese clothing

By |2019-09-15T07:00:27-07:00June 8th, 2017|China|

Silkworms and silk history Silkworms make silk People make silk from the cocoons of silkworms. Have you ever seen a butterfly cocoon? It is just like that. You have to take zillions of these cocoons and unwind them carefully, and that makes long threads like spider webs, and you spin these together to [...]

What are segmented worms? Annelids, evolution, and biology

By |2019-01-27T20:52:49-07:00May 27th, 2017|Biology - Evolution, from cells to modern mammals, birds, and reptiles|

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 biology articles What were annelids like? The earliest annelids all lived in the ocean, as most kinds of annelid still do today. Some [...]

What are intestines? Evolution and Digestion

By |2017-09-17T09:06:21-07:00May 26th, 2017|Biology - Evolution, from cells to modern mammals, birds, and reptiles|

Whale intestines (from Medicine Chest) The first animals to have anything like an intestine evolved around 548 million years ago. These were roundworms, just a few millimeters long, and they had just a simple tube running from their mouth to their anus - no stomach in the middle. But already these roundworm guts [...]