Because Bacteria evolve far faster than humans, bacteria would be ideal for testing evolution. If you isolate one bacteria population from another after a while they should evolve into different species, right? Actually, I have heard this test has already been carried out but is this true? If so, how far has the isolated bacteria evolved? Have they evolved into different species and maybe even into different families of bacteria? Who knows, maybe even a different order or class? If this hasn't been tested, why hasn't it? This is the best way to prove evolution beyond the species, genus, family, order, class ect. barrier because bacteria evolve far faster than we do. This will definitely shut the creationists and anti-evolutionists up.