A newly discovered group of 2.1-billion-year-old fossil organisms may be the earliest known example of complex life on Earth. They could help scientists understand not just when higher life forms evolved, but why.
The fossils — flat discs almost 5 inches across, with scalloped edges and radial slits — were either complex colonies of single-celled organisms, or early animals.
Either way, they represent an early crossing of a critical evolutionary threshold, and suggest that the crossing was made necessary by radical changes in Earth’s atmosphere.
Friday, July 9, 2010
Earliest Known Multicellular Life
Posted by Sugar and Snark at 1:53 AM