Why does natural selection not result in perfect organisms?
Natural selection- the differential survival and reproduction of variant individuals within a
population- is the prime mechanism of evolutionary change. As individual organisms interact
with their environment, some individuals are more succesful than others in surviving,
obtaining energy, reproducing etc. These differences in individual reproductive success result
in changes in the genetic makeup of the population over time. These changes represent
evolutionary change and result in adaptation of organisms to their environment.
Evolution by natural selection is, by necessity, a process of compromisse, in which costs are
minimized and benefits are maximized. The development of any structure, or the performance
of any behavior, carries with it a cost- in terms of time or energy- to an organis