Changes

'''Speciation''' is the process by which new species arise. possibly by [[Darwin-Wallace evolution]]. It occurs due to [[natural selection]] and separation of populations of the same species, allowing allele frequencies in the two groups to change independently.  See [[evolution]] for a detailed dissection of the many problems of this theory.

'''Speciation''' is the process by which new species arise. Speciation occurs when gene-flow stops between two sub-populations due to geographic or behavioral isolation. During such isolation the gene pool of each sub-population reacts differently to the processes of [[natural selection]] and [[genetic drift]]. When such changes accumulate to the extend that crosses between members of each sub-population can no longer produce viable offspring each sub-population is considered to be a new species and speciation is said to have occured.

 

==Species==

==Species==

A [[species]] is:

A [[species]] is: