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From: wcalvin@milton.u.washington.edu (William Calvin)
Newsgroups: sci.bio
Subject: Re: 25 hr day
Message-ID: <5199@milton.u.washington.edu>
Date: 17 Jul 90 23:24:51 GMT
References: <33843@ut-emx.UUCP> <4982@milton.u.washington.edu> <563@argus.mrcu>
Organization: University of Washington, Seattle
Lines: 11

>Paul Johnson asks, so what has 25 hours between tides got to do with it?

Well. we are evolved from animals that used to make their living in the
intertidal (that was that stage in the evolution of land animals where
an ancestors learned to get along up in the air for hours at a time).
The rhythms of that life style are more like 25 hours than 24, as the
food is swept along by tidal currents.
  William H. Calvin
  Univ. of Washington      wcalvin@well.sf.ca.us
  Biology NJ-15         wcalvin@u.washington.edu
  Seattle WA 98195    206/328-1192  206/543-1648