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Looking at the examples of Yellowstone and Mount St. Helens, which type of succession best fits each ecological event?
a) Yellowstone – primary succession; Mount St. Helens – primary succession
b) Yellowstone – primary succession; Mount St. Helens – secondary succession
c) Yellowstone – secondary succession; Mount St. Helens – primary succession
d) Yellowstone – secondary succession; Mount St. Helens – secondary succession



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