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Evolvability

Evolutionary biologists are in the business of drawing evolutionary connections between biological systems. This requires identifying biological systems, relating them according to some similarity metric, and then telling evolutionary stories that, as it were, connect the dots. Yet for large-scale evolutionary changes, these stories tend to be imaginative reconstructions with little firm evidential basis. This is certainly true of attempts to bridge major divisions in the fossil record. It is also true of molecular phylogenies. Evolutionary biology's preferred research strategy consists in taking distinct biological systems and trying to merge them. Intelligent design, by contrast, focuses on a different strategy, namely, taking individual biological systems and perturbing them to see how much the systems can evolve (with and without intelligence). Limitations on evolvability by material mechanisms constitute evidence for design.

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