:::::I am not sure that the intro neds to be rewritten, but I do think that the explanation of "fact" needs to be explained.  The emeregence of the hawthorne fly is one example of an observed change.  But the fossil record also enables us to observe changes over time, as does DNA evidence fvrom different species, and comparative anatomy.  I think Axel's point is that these kinds of data are as much "the fact of evolution in action" as the observation of the emergence of the hawthorne fly over a fifty year period.    |