5.6 [ Speciation, Rate of Evolution, Macroevolution ]

     Natural selection leaves the strongest to survive, so the species with the favorable trait survives with the unfavorable trait dies. With only the desired traits to survive in the environment survive, some believe this is classified as a new species. This process is called speciation which is the formation of a new species, this is carried out by allopatric speciation which happens in three steps.

1) A physical barrier separates the species into two or more groups isolated from one another. A physical barrier is some change in the environment, an example would be a construction site on a river sperating the two sides.

2) Natural selection influences the environments in different ways because of the separation between the two or more and because of this species evolve in different ways.

3) Eventually, the two environments would have separated so much that the species that were split because of the physical barrier can no longer breed and have become separate species.