In the late 1700s scientists proposed that the layers in the rocks of mountains and canyons represented a record of the passage of time, with the younger layers lying on top of the older layers. What could they determine about the fossils they were finding in the rocks based on this observation?
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A. Fossils in upper layers were less weathered and more detailed than those in lower layers.
B. The oldest fossils were the same as the ones found in younger rock layers.
C. Fossils in upper layers were younger than fossils in lower layers.
D. The exact age of a fossil could be determined by counting the rock layers.