Answer: Carbon-14 isotope is used to date ancient artifacts such as fossils.
Step-by-step explanation:
To determine the age of ancient artifacts such as fossils, we use radiocarbon dating process.
In this process, a naturally occurring radioisotope of carbon which is Carbon-14 is used. This isotope is generally used because this isotope gets constantly created in the atmosphere with the interaction of cosmic rays with the nitrogen present in atmosphere.
Hence, an isotope of carbon which is Carbon-14 is used to determine the age of ancient artifacts such as fossils.