Assembling the Tree of Life

Scientists are organizing knowledge of all living things into a single evolutionary tree.

By Emily Sohn, 00:00 AM May 22, 2006

It's easy to see how you're related to your parents, grandparents, brothers, sisters, and cousins. It's not so easy to see how you're related to apple trees, worms, or elephants.

From algae to zebras, all living things on Earth have a common ancestor. The Tree of Life Project aims to show how these species are related to one another by putting them into a family tree. Biologists and other scientists all over the world are working to identify and sort Earth's organisms—from plants to microbe...

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