 Even so, developmental biology continued on its course until, at long last, we seem to understand development well enough to begin integrating it into the rest of biology. On the most conservative view, current versions of evolutionary theory can remain largely unchanged as development is grafted onto them. On a second view, both perspectives are likely to require some modification to achieve this integration. Our understanding of development may have to be modified, but so too for evolutionary theory (Pigliucci &amp; Müller 2010). Finally, at the other extreme, development will all but replace evolutionary theory. In their more exuberant moments, some advocates of Developmental Systems Theory (DST) seem to be claiming just that. Just as some molecular biologists think that molecular biology is rapidly replacing all the rest of biology, some advocates of DST argue that developmental theories will simply replace current versions of evolutionary theory.