Answer:
According to the U.S. Department of Education, most American colleges and universities award college credit by the semester hour. In order to receive an associate degree, you must earn at least 60 credits, which typically can be fulfilled by completing 20 three-credit courses.
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The brain is the body's control centre: it sends messages to your body through a network of nerves called “the nervous system”, which controls your muscles, so that you can walk, run and move around.