Which idea gives flexibility to the Constitution and illustrates the idea that it is a ‘living document’?

The Congress, whenever two thirds of both houses shall deem it necessary, shall propose amendments to this Constitution, or, on the application of the Legislatures of two thirds of the several States, shall call a convention for proposing amendments, which, in either case, shall be valid to all intents and purposes, as part of this Constitution, when ratified by the Legislatures of three fourths of the several States, or by conventions in three fourths thereof, as the one or the other mode of ratification may be proposed by the Congress; provided that no amendment which may be made prior to the Year One thousand eight hundred and eight shall in any manner affect the first and fourth Clauses in the Ninth Section of the first Article; and that no State, without its consent, shall be deprived of it's equal suffrage in the Senate.

Explanation:

they had freedom from the government and from the affairs

it depends on which society you are referring to. many civilization performed rituals so the gods would with their growing season but the most well known is that of the aztecs. they would make sacrifices, usually animals, but sometimes humans as well.