Radditsu, the article in your link demonstrates an important idea we began to notice a few decades ago.
Marked changes within a population can occur in just a few generations.
The rate at which evolution can occur is tied directly to the length of the organisms reproductive cycle.
This means microevolution is absolutely something an individual can observe within his or her lifetime, especially within bacteria.
Evolution still does not occur at the snap of a finger.
Evolution does occur much faster than classical biologists assumed.
They just thought you couldn't see the steps.
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