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The answer should be D, nonverbal communication. One's willingness to do, say, or think something does not have to be communicated directly. It can be shown through other actions or behaviors.
The Hammurabi code of laws, a collection of 282 rules, established standards for commercial interactions and set fines and punishments to meet the requirements of justice. Hammurabi's Code was carved onto a massive, finger-shaped black stone stele (pillar) that was looted by invaders and finally rediscovered in 1901.
I think the correct answer would be D. The brain waves changes from stage 1 to stage 2 as a person sleeps in a way that these waves become slower. That is, the amplitude would decrease since less activity is done and the frequency would decrease as well since less wave passes per second.