What was life like in the Americas prior to European exploration?

Some Native societies created innovations in agriculture, like irrigation, to help sustain permanent settlements.

Explanation:

the correct answer is ) possibility.

demonstrating opportunity cost is done through production possibility.

the opportunity cost can be demonstrated using the production possibility frontier or curve. this graphic shows the total number of possibilities for two products when we have the resources needed and used in an efficient manner. the main resources could be money, labor, and technology. the curve shows that the production of one good increases when the production of the othe

b) the planets year length would be longer

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