At the core of evolution are three simple observations.
First, among sexually reproducing organisms, no offspring is exactly identical to its parents.
Second, some traits of the parents are inherited by their offspring.
Third, most species naturally produce more offspring than could be supported by the environment.
Can anyone honestly dispute those three basic science facts? Yet as a logical consequence of the third observation, members of any species must compete over limited resources: some survive, some die. Because all offspring are different (first observation), some will have built-in survival advantages, and will be less likely to die. Then, some of these survival advantages will be passed on to the offspring of the survivors (second observation). Over several generations, this process eliminates the « unfit » individuals from the population, leaving ones with as many advantageous traits as possible. This, in a nutshell, is ‘natural selection‘.
Critics of Evolution Should First Learn the Subject
janvier 6, 2006 par iorsd