The problem is not just “that random mutation and natural selection are grossly inadequate to build complex structures,” argues biochemist Michael Behe, “they strongly tend to break them.” As a result, and a bit paradoxically, Darwin’s process can “help form new species and new genera, but chiefly by promoting the loss of genetic abilities. Over time, dwindling degradatory options fence in an evolutionary lineage, halting organismal change before it crosses the family line.”6
