Intestines for Kids - What's an intestine for? How do your intestines digest food?
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Intestines

Whale intestines
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 had tremendously important help in digesting food - inside each roundworm tube lived thousands of bacteria. These bacteria had evolved so that they could only live inside roundworm guts, and they ate some of the food the roundworm caught, but they also helped the roundworm digest the food and get more energy out of it.

Only a few million years later, segmented worms (annelids) had an intestine separate from the crop and the gizzard. The crop stored food, the gizzard


Stomach
Digestive system

Plants
Animals

To find out more about cells, check out these books from Amazon.com or from your library:

Cells
Biology
Chemistry
Math
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Copyright 2012-2014 Karen Carr, Portland State University. This page last updated 2014. Powered by Dewahost.
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