Description

The current view of science is that Earth is around 46 billion years old and the first 4 billion years of its development are known as the Precambrian period For the first billion years or so there was no life in Earth Then the first singlecelled lifeforms early bacteria and algae began to emerge Its unclear where they came from or even if they originated on this planet at all but this gradual development continued until around four billion years ago when suddenly in geological terms more complex forms of life began to emerge