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It seems that you do not understand how evolution works, which is by mutation. An animal does not suddenly 'grow' an extra leg, and a bacteria does not suddenly 'grow' a flagellum, these things are the cause of mutations.Quote:
One of which is baterial flagellum. Since it contains a system that needs all of its parts to work (and has parts that are only found in that system), then it could not have evolved since there would be no need for the parts unless the whole system was working. How can this organism know exactly what parts it needs to create a system that cannot evolve?
A mutation, as you may or may not know, is the result of a mistake in the DNA of the species. This mistake can cause abnormal growths, in the case of the bacteria, a flagellum. Now if this abnormal growth turns out to actually be beneficial, then the bacteria can survive a lot easier. Having a flagellum to move around can prove to be very useful indeed and help it to obtain more food. The obvious flow-on effect of this is that the bacteria with the flagellum reproduces more, and it's descendants all share the flagellum also.
Evolution is caused by the slow modifications of a species through mutations. The surrounding environment then dictates which of these mutations is successful. An organism never "knows" or "decides" which things to evolve.
As for DNA, it is further evidence of evolution, as it shows that every organism, every life form is linked, and must have originated from the same point.