A new study has revealed that life on Earth first appeared 3.75 billion years ago. This period is 300 million years older than previously thought.
The findings are based on an analysis of a handful of rocks from the Canadian province of Quebec. This rock is approximately 3.75 billion years to 4.28 billion years old.
Researchers first discovered fine stripes, lumps and tubes in the rock, which were apparently made by bacteria.
However, not all scientists agree that they belong to the biological center.
Now, after further analysis, a team of researchers at University College London discovered a larger and more complex mold inside the rock, consisting of one trunk and several branches on one side of it, about one centimeter long.
Researchers also discovered hundreds of partial circles along the ducts and stripes.
Researchers say that some of the molds could have been formed by a chemical reaction.
This is because no such template for chemistry has been discovered.