To establish the age of a rock or a fossil, researchers use some type of clock to determine the date it was formed. Geologists commonly use radiometric dating methods, based on the natural radioactive decay of certain elements such as potassium and carbon, as reliable clocks to date ancient events
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Items that are used as money often have little value in and of themselves. For example, the paper used to print money is not particularly valuable. Money has value because it is an exchange medium that people understand and accept as such. When everyone accepts that a bill or a coin has value, people can use it as a form of payment to purchase goods or services. Before money existed, people used other systems to perform exchanges.
Bartering involves a direct trade for goods and services. Although some aspects of this transaction are similar to the exchange of money, bartering required time as people hammered out the terms of the deal. Utilizing money as the medium for trade simplified transactions significantly. Trade and barter were precursors to the monetary system used in today's society. Although trade and barter may seem almost archaic, they were the business solutions for people who lived before the convenience of credit card processing.
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D. creation of a youth culture in the 1960s
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The baby-boom was a demographic phenomenon that occurred after WWII, between 1946 and 1964, characterized by an increase in the birthrate. This increment was due to the unprecedented global economic growth that followed the war. Consequently, the young range of the population was larger during the 50s and 60s, which combined with economic development, created a new branch of consumers in the market: teenagers and young people. The new teenagers, most of them from the middle class who had access to jobs, demanded new cultural goods, like rock music, comics, movies, art, etc. Young people did not only entered in the public sphere as passive consumers, but also as active members of the civil society, demanding for different politics towards sex, drugs, the Vietnam war, civil rights, women rights, and against the Cold War, and the Nuclear race, among other things. This created a totally new youth culture during the 60s, giving place to the hippie wave and counter-culture movement that characterized the second part of the 20th century.
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The spanish conquered the great Aztec and Inca empires by bringing diseases to kill most of them off quickly, scaring them with the horses, and using their more advanced superior weapons to kill them
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Logic.
If the word to be underlined was populace, the answer would be D. The inhabitants of a city or region. If the word to be underlined was officials, the answer could be any/all of the above.
