Q: Fact 1: Radioactive dating is used to determine the age of fossils. Fact 2: Radioactive isotopes are commonly used for dating . Given the two facts above, what is used to determine the age of fossils?

OPT: a). Conifers b). Sediment c). calcite d). skull e). loose soil f). cracking g). exoskeleton h). isotopes
A:
h).