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Stan's posting (9612.03) oversimplified the problem of picking 75%
f the lancian species. No one could imagine that the selection was
truly random. And each group would have experienced different
selection (extinction) pressures as a whole, as would each family
and order and so forth. The problem is in picking 75% overall, but
maybe only 30% mammals, 100% dinos and pteros, 60% birds, etc....
It may be (or more likely is not) rather random within narrowly
defined groups, but certainly not across the board.
Bonnie A.B. Blackwell, email@example.com
Dept of Geology, off: (718) 997-3332
Queens College, City University of New York, fax: (718) 997-3299
Dept of Earth \& Environmental Sciences, fax: (718) 997-3349
The Graduate Center, CUNY, fax: (718) 997-3513
Flushing, NY 11367-1597 messages: (718) 997-3300