Here is the answer!
This is a very useful vertical timeline called the Geologic Time Scale.
It represents the entire history of the Earth since its formation, roughly 4.6 billion years ago.
The Geologic Time Scale is broken up into several periods of time, during which there were great changes in the biodiversity on Earth.
We can see distinct changes in the flora (plants) and fauna (animals of each time period.
The age range of each period is determined by radiometric dating.
Let's explore some of the major changes in life on Earth.
