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The table below shows the fossils of organisms found in various layers of an undisturbed rock:
Which statement about the organisms whose fossils are found in the rock is correct?
A: Organism W existed much before Organism Y
B: Organism Y existed over the longest period of time
C: Organism Y and Organism U were alive over the same time span
D: Organism W existed over a shorter period of time than did organism X
