Distillation works because lighter molecules are a little quicker to evaporate. Light Year One light year is the distance that light travels in one year. This means evolution at the level of a species, or higher. For example, the evolution of land animals into whales would be macroevolution. Many Creationists say that their argument is with macroevolution, and not microevolution.
Most scientists consider macroevolution to just be microevolution which has gone on for a long time.
This means evolutionary change within a species. See macroevolution for the difference between these two ideas. Micron A micron is one micro-meter. So, a thousand microns is a millimeter, and 25,400 microns is an inch. The diameter of an atom is less than a nanometer, so a row of atoms one micron long would have several thousand atoms.