If you haven't done so already, please take a moment to read About Biomorphs, which will give you some insight into the following demo program by explaining how it works, what the underlying assumptions are, and just what all this has to do with evolution. (Please note that if you do not see a red line drawing in the middle panel, or if nothing happens when you click the red drawing, then your browser may be too old to support this program. We recommend Internet Explorer or Netscape versions 4.0 or greater.)