If evolution is this grand process that has transformed the simplest life into people, it should surely be demonstrable in the laboratory. In fact, extended experiments with fruit flies have produced many types of deformed fruit flies, but they remain fruit flies. Evolutionists will point to the large amount of time needed for evolution to work, but on the order of 10,000 generations of fruit flies have been bred and exposed to many times a naturally-occurring amount of mutation-inducing radiation, with no indication that any type of increase in complexity (upward evolution) is happening! These experiments show (like plant and animal breeding) that organisms have a certain capacity for change which cannot be exceeded. This is to be expected, as change is limited by the genetic potential present.