How did humans become humans
[From: ] [author: ] [Date: 12-08-13] [Hit: ]
the two halves of the common ancestor species stop interbreeding (perhaps becoming separated by some natural obstacle). In the following thousands and millions of years the two separated halves gradually evolve in different directions until eventually, even if the met up again, they would not recognise each other as the same species or be able successfully to interbreed.-How did humans become humans?Descent with modification across the generations,......
The division between apes and early humans, along with the division between any two diverging species is only apparent with the benefit of hindsight. At no time did an 'ape' ever give birth to a human. At the point of divergence from a common ancestor there is no apparent or actual difference between the members of both species-to-be. But at that point, for whatever reason, the two halves of the common ancestor species stop interbreeding (perhaps becoming separated by some natural obstacle). In the following thousands and millions of years the two separated halves gradually evolve in different directions until eventually, even if the met up again, they would not recognise each other as the same species or be able successfully to interbreed.
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"How did humans become humans?"
Descent with modification across the generations, as acted upon by natural selection.
"... the mitochondrial eve, was she human, or the mother of the first human, or something else entirely?"
She was human, as were her parents, and the most recent common female ancestor of all living humans. She wasn't the first human. And she almost certainly never met Y-cfromosomal Adam. That was the most recent common male ancestor of all living humans. His parents were humans too, and presumably descendants of the Eve you mentioned.
The first human would be the first member of the genus Homo or, should your prefer, the first member of the species of Homo sapiens. Personally, I go for the wider grouping. That first human bred with an extremely human-like, sexually compatible partner (or perhaps several).
In reality, concepts such as geneus and species aren't as tightly isolated from one another as originally thought. Up until the 1850s it was generally believed that members of even closely related but differént species couldn't produce fertile offspring. While it was generally believed, it wasn't actually correct. Due to evolution, the supposed lines between different species are blurs rather than being sharply defined.
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