5 3. After an animal dies, the amount of radioactive carbon-14 in its bones declines. Archaeologists use this fact to determine the age of a bone based on the percent of carbon-14 remaining in the fossilized bones. The relation shows the age, A, in years, of an animal based on the percent, c, of carbon-14 remaining. Percent of Carbon-14 Radiocarbon Dating Age (thousands of years) a. Is this relation a function? Why? (2) Answer: b. At Head-Smashed-In Buffalo Jump, in southwestern Alberta, the most recent bison bones found had 75% of the carbon-14 still remaining. From the graph, estimate the age of these bones. (1)