The geologic time scale is subdivided on the basis of
a. the appearance of different radioactive isotopes
in different strata.
b. levels of background extinction.
c. periods of mass extinction.
d. the appearance of different radioactive isotopes
in different strata and levels of background
extinction.
e. the appearance of different radioactive isotopes
in different strata, levels of background
extinction, and periods of mass extinction.
Answer: c
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