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Fossil records suggest a divergence of early hominid species from other great apes as far back as 7million years ago. However, those early hominids would not be recognized today as 'humans'.

There are two main scientific theories for the spread of humanity (Homo Sapiens) one 'out of Africa migration' occurring as much as 2 to 2.5 million years ago in the form of Homo Erectus and subsequent parallel evolution of Homo Sapiens from these geographically distinct but interbreeding populations (this is scientifically less likely than the following explanation but still plausible) and the other, significantly more recent migration, between 50,000 and 100,000 years ago in the form of modern human Homo Sapiens.

As the fossil record can only be regarded as a rough guide, it being incomplete, the safest answer to your question is to give a wide range during which we can be reasonably certain humans, in their current form, have inhabited the Earth. The range I would give is greater than 50,000 years but not more than 2 million years. As this range is so wide it is extremely likely to be improved upon by other contributors.

However, there are many speculations on how long humans have walked the earth, but none have been confirmed.

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14y ago

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