[tallhappy]

You've already made it quite plain that you've investigated it carefully and rejected it

I do not. I never said that. I have not made that clear nor have I ever said anything that indicates that.

Come on, how do species arise?

[Thatcherite]

I'm not quite clear. Do you reject evolution or not? If you reject it did you examine it carefully first or not?

Why do you want anyone to teach you evolution 101? Somehow from your posting history I'm not suspecting "honest enquiry" is the answer.

[Ichneumon]

Come on, how do species arise?

By change in the genepool across generations, to the point where a descendant population is sufficiently different from its ancestral population to warrant being considered a different species, due to breeding incompatibilities or significant differences in phenotype.

Factors which facilitate, induce, or accelerate this process in various ways include (but are not limited to) mutation, natural selection (both positive and negative), genetic drift, geographic isolation, sympatric isolation, sexual selection, hybridization, ecological opportunity, founder effects, parapatric isolation, and so on.

There is some overlap in the above list -- for example, founder effects are usually a special case of geographic isolation.