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You find fossil teeth of the sharks C. megalodon and C. carcharias together in the same bed of gray limestone. C. megalodon ranges in age from 16 to 3 million years (Ma) and C. carcharias ranges in age from 5 million years to today. How old is the rock layer (e.g. concurrent range)? A) 0-16 Ma B) 3-16 Ma C) 3-5 Ma D) 0-3 Ma
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