finding out whether a rhythmically recurring geologic force exists
confirming previous evidence suggesting that extinction of terrestrial species occurred regularly
18. The author of the passage would most likely describe the findings of Raup and Sepkoski as
plausible, because the findings supported the theories of previous researchers
significant, because the findings were an impetus for subsequent research
controversial, because the findings contradicted the theories of previous researchers
questionable, because the authors were not working in their field of expertise
definitive, because the findings confirmed the existence of a rhythmically recurring force
19. The author of the passage is primarily concerned with
determining the dates of various geologic events
defending the conclusions reached by Raup and Sepkoski
establishing a link between the disciplines of paleontology and geology
proving that mass extinctions of marine animals occur periodically
explaining how a theory concerning geologic events was formulated
20. The passage suggests which of the following about the force mentioned in lines 16 and 18?
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