Question

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

Answer 1

The correct answer is - extinction of one localized species.

The extinction of one, localized species has no impact of separating the geologic time, as if that was the case, there were going to be eras, periods, and epochs on every few hours, days, and months.

The geologic time is separated into the eras, periods, and epochs because of periods of major extinctions that took place all over the planet. Also, each of them is defined with its own unique flora and fauna, but also with certain geologic activities and changes in the Earth.

Answer 2

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.