How does natural selection occur?
Natural selection is basically the pressure that Nature puts on an species’ ability to survive. It acts on physical characteristics of a species by placing a premium on physical changes that give it an advantage in reproduction. This advantage allows members with this trait to continually represent a larger percentage of the species population as a whole. For example, if white moths develop a mutation that make some of them black and this coloration enhances their chance of survival then, eventually black moths will dominate the species.
