Geologic time is separated into eras, periods, and epochs by each of the following except:

Question 2 options:

major extinctions

periods of biological diversity

changes in earth's geology

extinction of one localized species

I think the correct answer from the choices listed above is the last option. Geologic time is separated into eras, periods, and epochs by each of the following except extinction of one localized species. It separate the whole rather than specific groups of species. Hope this answers the question. Have a nice day.