Natural differences
asked Feb 23, 2012 by anonymous

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The biggest difference between species is that they cannot have successive generations of offspring. You can for example have a lion and tiger breed and get a liger but the liger will not be able to successfully breed.  This demonstrates that lions and tigers, although related, are of different species.
answered Feb 23, 2012 by mshelton Level 3 User (8,500 points)
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