The Text Presents the Experiments of Richard Lenski and His

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The text presents the experiments of Richard Lenski and his colleagues,who set up long-range experiments on E.coli.In the experiment illustrated in the figure above,12 parallel E.coli lineages were created and maintained,cells from each line were periodically frozen,and the team followed the lineages for more than 50,000 generations.Why were these experiments groundbreaking? How have these experiments revolutionized the sorts of questions evolutionary biologists can ask?