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A possible explanation for the fact that an isolated quark has yet to be found is that
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A country in North America composed of 50 states, a federal district, and various territories, known for its high standard of living and significant global influence.
19th Century
The period from 1801 to 1900, marked by significant industrial, cultural, and political changes worldwide.
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A form of marriage in which an individual has only one spouse at a time.
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A mating system in which a male has more than one female partner at the same time.
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