Archaeologists use to determine the age of artifacts by measuring the radioactive decay of an artifact.

the answer. is b

hope this : d

china unilaterally claims the entire south china sea as sovereign territory, then builds artificial islands to bolster its claim. it suddenly activates an air defense identification zone over the east china sea, and threatens to down any aircraft that does not report its position. it builds roads into indian territory, then redraws the maps to show that it is actually chinese territory. the people's republic under president xi jinping is quickly becoming the bully of asia.

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barack obama

44th president of the united states