In fact, natural selection often leads to ever greater simplicity. And, in many cases, complexity may initially arise when selection is weak or absent. If you don’t use it, you tend to lose it.

From natural selection to the history of nature -- From the units of inheritance to the origin of species -- Multicellularity and the developmental code -- Life cycle evolution : life and death of the ...

Vol. 31, No. 2, Supplement. Macroevolution: Diversity, Disparity, Contingency: Essays in Honor of Stephen Jay Gould (Spring, 2005), pp. 146-156 (11 pages) A simple principle predicts a tendency, or ...