Complex Life May Have Begun 1.5 Billion Years Earlier Than Believed
Humans, cats, dogs, chickens, rats, trees, fungiโtoday, complex life on Earth comes in a remarkable number of variations. Its evolution has taken many twists and turns over millions of years, including the asteroid that wiped out the dinosaurs and the development of โlegsโ for sea creatures to take to the land. But when did this prehistoric parade of evolution begin? Evidence of microbes has been discovered dating back 3.7 billion years.