8 years ago
Meet Luca, the Ancestor of All Living Things
This venerable ancestor was a single-cell, bacterium-like organism. But it has a grand name, or at least an acronym. It is known as Luca, the Last Universal Common Ancestor, and is estimated to have lived some four billion years ago, when Earth was a mere 560 million years old.
Continue Reading
http://www.nytimes.com
Join the Discussion