Today, the fossil record

A. can be dated reasonably well only with uranium-238.
B. can be dated precisely, to within a single year, using DNA hybridization.
C. can be dated precisely, to within a single year, using radioactive isotopes.
D. can be dated reasonably well using a variety of radioactive isotopes with known half-lives.
E. can be dated only in terms of how layers relate to each other (i.e. older layers are below younger layers); no actual dates can be estimated.


Answer: D

Biology & Microbiology

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