On what is the geologic time scale based? A: evolutionary events

B: geologic events

C: geologic and biologic events

D: changes in climate and historical

not too sure on this one thinking tyo organize the division of africa

- three-quarters or two-thirds..

- "the constitution provides that an amendment may be proposed either by the congress with a two-thirds majority vote in both the house of representatives and the senate or by a constitutional convention called for by two-thirds of the state legislatures."

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