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This [long enuf] is an analytic statement, therefore, that argument
is invalid.
I was told different species can't produce fertile offspring. II don't think this is either a necessary or sufficient condition for
suspect in the course of change a time comes when there are two
lineages that, tho mating would be successful, don't mate because
they "look ugly" to each other (metaphor). At this point change will
accelerate to the point they are "really" different species.