Final answer:
Relative dating is the advancement in archaeology that helps Oliver conclude that the cup is older than the pacifier.
Step-by-step explanation:
The advancement in archaeology that helps Oliver conclude that the cup is older than the pacifier is relative dating. Relative dating is a method used to determine the age of artifacts or events by comparing them to other artifacts or events in the same context or layer. In this case, since the pacifier was found above the broken cup, Oliver can conclude that the pacifier is younger than the cup.
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