div class=ts-pagebuttonPage 1button div class=ts-image amp-img class=ts-thumb alt=Page 1: On the evolutionary treadmill src=https:reader030vdocumentsmxreader030viewer2022020312575068931a28ab0f07b0cc08html5thumbnails1jpg width=142 height=106 layout=responsive amp-img divp© 1994 Nature Publishing Grouppdiv