The horizontal axis of the cladogram depicted below is a timeline that extends from 100,000 years ago to the present; the vertical axis represents nothing in particular. The labeled branch points on the tree (V–Z) represent various common ancestors. Let's say that only since 50,000 years ago, there be enough variation between the lineages depicted here to separate them into distinct species and only the tips of the lineages on this tree represent distinct species How many separate species, both extant and extinct, are depicted in this tree?
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