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Re: "Common ancestor" in cladistics
It certainly makes a heck of a lot more sense to think that they existed and we
will never be able to identify them than to think that they existed but we'll
never be able to find them. It would be too much of a coincidence to find
hundreds of fossils and not have at least one that is an ancestor of another
one (even if that other one has not been found).
Thinking about all the possible gradations of species that must have exited
from one ancestor to a particular descendant, the total number of dinosaur
species to have existed must be staggering.
A better way to Internet