Anyone who has read Darwin knows that evolution can be broken down into 3 basic ideas: inheritence, selection, and change. What evolves, is the organism. But where, exactly, that evolution takes place has always been debated. For almost 200 years scientists have argued the where of inheritence. Today it is known that the primary item of inheritence is DNA. DNA is passed from parent to child, ad infinitum. Some (like Dawkins) take a hard line approach to this and exclude anything but DNA as the item of inheritance. But, there are other alternative theories.