Speciation: the process of change in a population that produces distinct populations which rarely naturally interbreed due to geographic isolation or other factors.
Speciation is observable and fits into the category of operation science. Speciation has never been observed to turn one kind of animal into another. Lions (Panthera leo) and tigers (Panthera tigris) are both members of the cat kind, but they are considered different species primarily due to their geographic isolation. However, it is possible to mate the two. Ligers (male lion and female tiger) and tigons (male tigers and female lions) are produced (with varying degrees of fertility). These two species came from the original cat kind that would have been present on Noah's Ark.
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