WEIT 2012 Chap7
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THE ORIGIN OF SPECIES
A species ? What's that ?!
First of all, we will define a species as a group of population whose members have the potential to reproduce with one another in nature ; and thus produce fertile offspring. Actually a reproduce compatibility is useful and more important than a physical similarity ! For example, a woman coming from Japan can marry a French man and they can have children together even if visually the two parents don't look the same. But this would be a very simplified version of the definition of the species meaning. In fact there are several ways of defining a species and being or not a species depends of many parameters.
How do species appear ?
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