You are talking about the size of population, I am talking about number of species.
For example, a lion and a tiger are different species but are of the same genus.
LION
Family: Felidae
Genus: Panthera
Species: Panthera leo
TIGER
Family: Felidae
Genus: Panthera
Species: Panthera tigris
While cell fusion would allow them to reproduce, they would produce a different species yet since they are not geographically situated in the wild they do not exist in the wild. However, ligers know to exist are those born in captivity. Ligers and tigons are not a products of evolution but rather procreation.
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