Today, the Fossil Record

Multiple Choice

Today, the fossil record

A) can be dated only with one layer in relation to older layers below and younger layers above, no actual dates can be estimated.
B) can be dated reasonably well only with uranium-238.
C) can be dated reasonably well using a variety of radioactive isotopes with known half-lives.
D) can be dated precisely, to within a single year, using radioactive isotopes.