sponges

28 05, 2017

What is a sponge? Porifera, Evolution, and Biology

By |2018-04-13T14:35:53-07:00May 28th, 2017|Biology|Comments Off on What is a sponge? Porifera, Evolution, and Biology

A group of brightly colored sponges in the ocean For almost three billion years, the only living things on earth were one-celled creatures, either prokaryotes or eukaryotes. Even today, the [...]

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 [...]

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