Diverse microbial life existed on Earth at least 3.75 billion years ago, suggests a new study led by UCL researchers that challenges the conventional view of when life began.
All life on Earth likely emerged from one spark in Earth s early history. Some time later, it diversified, branching off into lineages that helped it survive.
Researchers at University College London have discovered a complex structure inside the rock - a stem with parallel branches - which they say is most likely biological in origin.