Question

2 which elements isotope is commonly used to determine when biological samples such as fossils were formed? multiple choice sulfur oxygen carbon hydrogen nitrogen

Explanation:

Carbon - 14 dating is a well - known method for determining the age of biological samples like fossils. Carbon is present in all living organisms, and its radioactive isotope carbon - 14 decays at a known rate. By measuring the remaining amount of carbon - 14 in a sample, scientists can estimate when the organism died and thus when the fossil was formed.

Answer:

C. carbon