According to the doctrine of separation of powers, the U.S. Constitution distributed the power of the federal government among these three branches, and built a system of checks and balances to ensure that no one branch could become too powerful.
<span>Fernando's worrisome thoughts about a break-in are an obsession. The fact that Fernando checks the locks over and over is a compulsion. Obsession and compulsion are classic symptoms of Obsessive Compulsive Disorder. The obsession is described as a compulsive thought that the person can not stop or eliminate and that generates discomfort. <span>Compulsion is described as a behavior that the person is forced to do to decrease their anxiety and intrusive thinking.
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an ability to learn from mistakes and adapt to new knowledge
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humans started to work with metal. Bronze tools and weapons soon replaced earlier stone versions.
first writing systems and the invention of the wheel.
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