refers to the period of time before writing was invented.

The answer is prehistory. History was the time once things started being documented through writing, as that is how history is relayed from one nation or generation to the next.

- 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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b) brahmans   is nomadic society