Observed adaptation: It is hopefully common knowledge that bacteria have been constantly adapting to survive the antibiotic assaults of mankind. It is hopefully also common knowledge that successive generations of cockroach can become resistant to chemical pesticides, as can numerous other forms of insect. A more specific example is the British peppered moth. Before the nineteenth century it had only been seen in a gray variant, but in 1850 a black mutant variant was seen. The black variant was not successful because it was so easily spotted by predators, compared to its gray brethren which could blend into the tree bark. However, the black variant remained in the species as a recurrent strain due to a recessive gene, and it began to dominate after the Industrial Revolution. There is some debate as to why and how the Industrial Revolution caused this change, but no one can dispute that they were predominantly gray before the Industrial Revolution and predominantly black afterwards, thus acting as an example of environmentally driven change, ie- evolution.