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Old December 1 2012, 01:22 AM   #32
st.barthgirl
Lieutenant
 
Location: I Believe in Dog
Re: Why no comment on the number of human species?

i just today thought of the issue of Hybrid Vigor. i wonder if that's ever been seen in the star trek universe? The principle by which Ligers and Tions and polar/grizzlies are generally larger and more robust than their Parents?And why many mixed breed dogs are healthier than Purebred?
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