Please answer the following question: Fact 1: Radioactive dating is used to determine the age of fossils. Fact 2: Radioactive dating requires the use of a decay curve. Given the two facts above, answer the question "What is used to determine the age of fossils?" with the following options: - Calcium carbonate - dinosaurs - a barometer - electron microscope - a thermometer - a decay curve - chemical equations - Physical weathering
A:
a decay curve