Key point: evolution does not necessarily working towards more complexity or a specific endpoint. Rather, the unique selection pressures that exist when organis

Key point: evolution does not necessarily working towards more complexity or a specific endpoint. Rather, the unique selection pressures that exist when organisms attempt to reproduce vary, as do the particular genetic changes that happen due to any number of factors (mutation, viruses, gamma rays, copy errors, bacterial absorption, whatever). Each generation may face similar or different pressures. Certain mutations may be more or less likely. In some cases, the mutations that survive may be pure random chance. In others, only a specific mutation may have saved the organism's particular genes from extinction. The future organisms and genes that emerge from this chaotic process are unpredictable. Sometimes those organisms will lose features, sometimes gain, sometimes have weird changes that don't appear to make sense. All that matters is: do the organisms continue to reproduce successfully generation after generation?