Answer:
All ancient fossils contain C-14
Step-by-step explanation:
All living things contain more than one isotope of carbon, the most prominent being, carbon -12 and carbon-14.
Carbon-14 is a radioactive isotope of carbon. When the artifact is retrieved, the activity of carbon-14 in that sample is matched with the carbon-14 activity of a living organism. When this is done, the age of the fossil can easily be accurately calculated.