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What are E. coli bacteria? Cell biology

By |2019-05-19T07:36:49-07:00May 28th, 2017|Biology|

E. coli bacterium under a microscope Where do E. coli bacteria live? E. coli are a very common kind of prokaryote cell that lives mainly inside mammals and birds, including inside you. What are prokaryotes? What is dysentery? All our biology articles What do E. coli bacteria do? They can only live for [...]

What are intestines? Evolution and Digestion

By |2017-09-17T09:06:21-07:00May 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 |2019-05-07T20:07:23-07:00May 26th, 2017|Biology|

Digestive system: 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. Before digestive systems... 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 [...]