What is evolution?

Evolution is an unpredictable and natural process of temporal descent with genetic modifications that is affected by natural selection, chance, and changing environments. An easier more simplified definition is a change in the gene pool of a population over time. A gene is a hereditary trait that can be passed on for many generations. The gene pool is the set of all genes in a species or population. In order to understand evolution, it is …

…the distinction between the two is irrational, macroevolution is cumulative microevolution. The word evolution has a variety of meanings. The fact that all organisms are related by descent to a common ancestor is usually called evolution. The argument of how the first living organisms came about is usually called evolution. This should be called abiogenesis. Very commonly, people use the word evolution when they really mean natural selection (one of the many workings of evolution.)