/Tag: sponges

Proterozoic Eon – eukaryotes to worms

By |2018-04-21T11:56:39-07:00June 24th, 2017|Biology, Geology|

Two and a half billion years ago, the Archaean Eon ended and the Proterozoic Eon began. Trillions of prokaryote cells lived in Earth's oceans. Some of these cells could photosynthesize their energy from sunlight, water, and carbon dioxide. These photosynthesizing cells pooped out a lot of oxygen. By about 2.3 billion years ago, the iron [...]

What is a sponge? Porifera, Evolution, and Biology

By |2018-04-13T14:35:53-07:00May 28th, 2017|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 vast majority of the living things on earth are one-celled creatures, or microbes. But about 600 million years ago, a few one-celled creatures [...]

Looking at a sponge – Evolution and Biology

By |2018-04-16T09:21:36-07:00May 28th, 2017|Biology|

Science project: Buy a natural sponge - click here A science project with sponges You can check out sponges for yourself - go to any Whole Foods or other natural health products store and they'll have real natural sponges there for people to clean themselves with. Some questions to ask yourself What does [...]

What are segmented worms? Annelids, evolution, and biology

By |2019-01-27T20:52:49-07:00May 27th, 2017|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 biology articles What were annelids like? The earliest annelids all lived in the ocean, as most kinds of annelid still do today. Some [...]