Name two causes of genetic variation, and explain how they apply to the process of natural selection.

Genetic drift
- initially from same species however due to natural circumstances some of the species relocates resulting in them evolving based in surroundings hence the process of natural selection; the survival of the fittest

Genetic bottleneck
- due to a natural disaster or crisis a species almost becomes no existent resulting in the remaining organisms of such species to repopulate resulting in only the fittest organisms of that species surviving hence once again the process of natural selection

The greatest way to explain natural selection is Darwin in the Galapagos island with the finches; Darwin studied these birds and discovered based on geographical location the same species of bird had evolved as identified by the change in beak structure in order to scavenge for food. The best way to explain it is the survival of the fittest same with long neck giraffes all the short neck giraffes died off due to them not being able to reach the leaves to eat