The conclusion of an argumentative essay should

Conclusion is the last part of an speech, essay or anything. It finishes the thing which we are doing and concludes it. Like if your telling a speech, you finish it by summarizing or telling a message. Like that you end it. Your conclusion of an argumentative essay should end summarizing or covering all the main points about the problem. You should not rise up new problems in your conclusion because your conclusion concludes or solves or closes the problem.

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it foreshadows the theme of the paragraph and hints the topic that will be discussed in the paragraph!

a. theta waves. this is because the person is in a light sleep which means the brain waves would show these kind of waves.