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What are E. coli bacteria? Cell biology

By |2017-05-28T22:11:41+00:00May 28th, 2017|Biology|

E. coli bacterium under a microscope E. coli are a very common kind of prokaryote cell that lives mainly inside mammals and birds, including inside you. They can only live for a short time on their own, because they have evolved over time to live inside animals. E. coli live in your intestines, [...]

What are intestines? Evolution and Digestion

By |2017-09-17T09:06:21+00:00May 26th, 2017|Biology|

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 [...]

Digestive System – Biology and Evolution

By |2018-04-13T14:31:40+00:00May 26th, 2017|Biology|

A hydra eating: the mouth is where all the tentacles come together,near the center of the picture.The hydra is eating the round bug in its stomach. Starting about 3.8 billion years ago, during the Archaean Era, one-celled creatures were the earliest living things. They just floated in the ocean and took in food in [...]