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Re: Stratigraphy, biogeography & cladograms

In a message dated 1/19/99 5:08:01 PM EST, bettyc@flyinggoat.com writes:

<< If you can define descendants, aren't you be default define ancestors? >>

Not only that, but the ancestors are paraphyletic taxa, since they don't
include any of their descendant species (let alone all of them).