17. What subdivisions make up the geologic time scale? What is the primary basis for differentiating the eras?

Question: 17. What subdivisions make up the geologic time scale? What is the primary basis for differentiating the eras?

Answer: The Correct Answer is The major subdivisions of the geologic time scale, from longest to shortest, are eon, era, period, and epoch. Life-forms (fossils) were the primary basis for differentiating the eras.

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The correct is The major subdivisions of the geologic time scale, from longest to shortest, are eon, era, period, and epoch. Life-forms (fossils) were the primary basis for differentiating the eras.

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