Question

which phrase describes carbon - 14 dating?
○ uses the rate at which nitrogen - 14 decays into carbon - 14
○ dates the remains of organisms to determine when they died
○ measures the number of unstable elements in ancient volcanic rocks
○ determines the age of ancient fossils older than 50,000 years old

Explanation:

Carbon - 14 dating uses the rate at which nitrogen - 14 decays into carbon - 14. It measures the amount of unstable carbon - 14 in organic remains to determine when an organism died. It is mainly used for dating relatively recent organic materials, not for fossils older than about 50,000 years.

Answer:

uses the rate at which nitrogen - 14 decays into carbon - 14