Out understanding of prehistory comes from what two things

シルス here!!

Explanation:

Prehistory (or pre-history) is the time before people began to write. The word comes from the Ancient Greek words προ (pre = "before") and (historia = "history"). Paul Tournal first used the French word Préhistorique. He found things made by humans more than ten thousand years ago in some caves in France. The word was first used in France around 1830 to talk about the time before writing.

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by using  production possibilities graph.  opportunity costs are key expenses in financial matters and are utilized as a part of registering money saving advantage investigation of a venture. such expenses, be that as it may, are not recorded in the record books but rather are perceived in basic leadership by processing the money costs and their subsequent benefit or misfortune.