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Under which exchange rate system was a dollar redeemable for gold only if the dollar was presented by a foreign central bank?
Organizing Principle
A core concept or belief that structures and guides the behavior of a system or society.
Evolutionary Change
The process by which species undergo modifications and adaptations over time leading to new species formations.
Genetic Material
The molecules inside cells that carry genetic information, primarily DNA and RNA, which determine hereditary characteristics.
Natural Selection
A process in biological evolution where organisms with traits better suited to their environment are more likely to survive and reproduce.
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