If the existence of Earth was represented by a foot-long ruler, where would the start of life, the start and end of dinosaurs, and the start of Homo erectus be? - Quora

What was the date 20,000 years ago? - Quora

If the existence of Earth was represented by a foot-long ruler

If the existence of Earth was represented by a foot-long ruler, where would the start of life, the start and end of dinosaurs, and the start of Homo erectus be? - Quora

How did life start on Earth? What was its first form, how did it evolve to what we have today? How long did it take for all this to happen (in days/years)?

Homo erectus The Smithsonian Institution's Human Origins Program

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How would life be like if Neanderthals, Homo erectus, Homo habilis, etc., still existed on Earth? - Quora

Evolutionarily, why don't giants exist? - Quora

If Earth had an ancient civilization 1-2 billion years ago, would it be impossible to find any evidence of it? - Quora

For how many years did mankind exist before Jesus? - Quora

What are the differences between eons, eras, epochs, periods, and ages? - Quora