How Long Have Humans Existed on Earth?

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How long have humans existed on earth really depends on if you believe in Darwin's theory of evolution. It is said that our human-like ancestors have been on earth for about 500 thousand years. Our modern Homo-sapiens have been on earth for about 100 thousand years. You can find more information here: http://astrobiology. nasa. gov/ask-an-astrobiologist/question/?id=1522
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Contrary to popular belief, humans came along millions of years after the dinosaurs disappeared. Fossil evidence shows that modern humans have only existed for about 200,000 years.
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During the Big Bang (the beginning of the universe) planets formed, as you probably already know. Particles may have grouped together to become the first single celled life forms
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It would probably be quite scary. The two major differences would be the amount of forests and the number of large animals. Forests Men tend to cut down forests for fuel, housing
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Humans exist in the world to procreate and inhabit this world, just like every other
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There is no way to know exactly how long human civilization has existed on earth, but it is believed to be about 200,000 years ago in Africa. Different religions ...
Hominid which is a term that refers to members of the family of humans have been in existence in earth from as early as six to eight million years ago. Some of ...
Geologists think that the earth was formed about 4,600,000,000 years ago. This is based on relative and absolute age dating techniques. ...
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