Continental collision 2.1 billion years ago may have sparked '1st attempt' at complex life on Earth

An artist’s impression of what Francevillian Basin "macrofossils" might have looked like if they were alive 2.1 billion years ago. .

Complex life evolved more than 1.5 billion years earlier than scientists previously thought, a new study claims. 

The findings push back the dawn of complex life from 635 million years ago to 2.1 billion years ago. However, some researchers say the theory needs more evidence.