What is silk? Ancient Chinese clothing
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 [...]
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What are segmented worms? Annelids, evolution, and biology
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 [...]
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What are intestines? Evolution and Digestion
Whale intestines (from Medicine Chest) When did intestines evolve? The first animals to have anything like an intestine evolved around 548 million years ago. These were roundworms, just a few [...]
