Existence of dark living in dark mice living in dark area and light mice living near light rocks. Lighter mice are preyed upon in dark and dark mice in light rock area.
Depending on the environment they live on these variants are the most populant.
**Moss b4 industrial revolution, white was more prevalent. After industrial revolution dark moths were camoflouged giving them an advantage against prey. So dark became more prevalent. There has been a slow return to light moss due to England becoming more environmentally aware.
**DNA experiences shifts and mutations that become the recipe for evolution.
MOST MUTATIONS ARE BAD BUT IN SOME CASES THEY CAN BE BENEFICIAL AND ADVANTAGEOUS FOR SURVIVAL SO THE ORGANISM WILL BE ABLE TO REPRODUCE AND PASS ON THE ADVANTAGEOUS GENE TO OFFSPRING**