What did archeologist learn from styding the graves and shelters at chaco canyon

By examining graves at Chaco Canyon, archaeologists found evidence of warfare, cannibalism and scalping.  and the evidence that shelters were built in protected places, possibly to defend themselves against their enemies

Explanation:

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★ By examining graves at Chaco Canyon, archaeologists found evidence of warfare, cannibalism and scalping. There was also evidence that shelters were built in protected places, possibly to defend themselves against enemies.

Explanation:

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congress also has implied powers, which derive from the necessary and proper clause of the constitution and permit congress "to make all laws which shall be necessary and proper for carrying into execution the foregoing powers, and all other powers vested by this constitution in the government of the united states.

formulating the initial idea for the policy

answer is c.