Answer:
They began to "settle" in the 18th century
Explanation:
Given the situation above regarding natural selection on mating peacocks, if ever females begin to change different criteria than feather color when they choose mates, what would eventually happen to the tails of the peacocks over time is that there would be a decrease in variation in <span>tail feather color because the only reason for variation was selection pressure. The answer is the last option.</span>
American citizens were fearful/anxious during the Cold War for several reasons, including:
1) Fear of communism taking over America- This ensured in what is known as the second "Red Scare." Americans worried that communism would spread to America, resulting in less individual rights and more government interference in their everyday lives.
2) Fear of nuclear warfare- The increased tensions between the Soviet Union and the United States left Americans constantly worrying about nuclear warfare. These fears almost came true in October of 1962, during what is now known as the Cuban Missile Crisis. Luckily, the leaders of the United States and Soviet Union were able to make a deal that stopped this all out nuclear warfare from happening.