<span>The answer is letter a. gold standard.
The move from the gold standard was a factor which led to the energy crisis, because OPEC began to price a barrel of oil against gold.
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A gold standard<span> is a monetary system whereby the standard economic unit of account is based on a fixed quantity of gold. </span>
Environmental determinism like Papua New Guinea, there's no resources on that island to even get the bronze age started on their own
Form simple, small light collecting telescopes to the huge multi-mirror telescopes like keck, they have all helped humans see further into space and collect more information about the universe at large. Technology has allowed astronauts do more than just look through telescopes now.