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Re: Birds, no mosasaurs [VERY long & theoretical]



In a message dated 98-02-25 00:20:26 EST, th81@umail.umd.edu writes:

<< And the fact that an "A" can only change to a "T", "C", or "G": other
 options being unavailable in Terran life. >>

Most morphological characters are not even four-state but only two-state
(e.g., present-absent, wider-narrower, touching-not touching, etc.). This
makes long branch convergence >more< likely in morphological analysis than in
molecular analysis.