Human twin and adoption studies imply that aggressive tendencies in human beings are "<span>at least partly influenced by genetics".</span>
Adoption studies are one of the great devices of behavioral genetics. These studies are used to gauge how much a characteristic shifts in light of environmental and genetic variety. Adoption studies are normally utilized together with twin studies while evaluating heritability.
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If isolationism has become outdated, what kind of foreign policy does the United States follow? In the years after World War II, the United States was guided generally by containment — the policy of keeping communism from spreading beyond the countries already under its influence. The policy applied to a world divided by the Cold War, a struggle between the United States and the Soviet Union.
With the collapse of the Soviet Union in 1991, containment no longer made sense, so in the past ten years, the United States has been redefining its foreign policy. What are its responsibilities, if any, to the rest of the world, now that it has no incentive of luring them to the American "side" in the Cold War? Do the United States still need allies? What action should be taken, if any, when a "hot spot" erupts, causing misery to the people who live in the nations involved? The answers are not easy.
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