What are the three types of variation among organisms of the same species :Evolution and Natural Selection?

I've never heard of 3 types of variation. Contrary to the above answer, variation *is* limited. Observation and experiment shows us that there is a limit to traits in living things. For example you can try to breed large dogs, but you'll never breed one as big as an elephant. People have tried to breed sugar beet to contain as much sugar as possible, but a limit is reached (about 17% I seem to recall). Genes contain an enormous capability for variation, but only within limits. This is because the kinds of plants and animals were created 'after their own kind' by God. Just as is written in Genesis, so we discover it to be true with the benefit of genetics. Note that 'species' is an artificial label, albeit helpful in many cases. Sometimes a species is defined along the lines of creatures that can interbreed. However lions and tigers are different species, yet can interbreed. God's created kinds are clearly at a higher level than species - perhaps typically family or genus. There is a lot of confusion about the word evolution. Some people use it to mean simply Natural Selection, which is observed and not controversial (eg Darwin's finches in Galapagos). But is is also used to mean the hypothesis that one kind of animal has changed into another. E (goo-to-you) is the hypothesis that animals can change into different kinds of animals by means of natural selection working on genetic mutations. These alleged mutations need to have added vast amounts of genetic information. However no such genetic mutation has ever been observed. Mutations are information neutral or lossy. 'But E is too slow to see' protest the Eists. Well then it's not observable and not worthy of being even called a theory. In any case, time is the enemy - mutations are resulting in the degradation of the gene pool - that is observable.