Around 2 to 3 centimeters separated the dinosaurs and the humans on Earth. Depending on your definition, modern Homo sapiens is only 200,000 to 50,000 years old. The human lineage only diverged from our most recent common ancestor roughly 5 million years ago, less than half of 1% of that period.
The geologic time scale separates the history of the earth into periods depending on the types of life that have existed there since the planet's formation. Geochronologic units are the name given to these divisions. Before humans arrived on Earth, over 65 million years had passed since the extinction of the dinosaurs.
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