Examine the following psa. A poster of a man and girl that reads, "the smallest change can make the biggest difference. Peace corps. Live, learn, and work with a community overseas. Be a volunteer. " the main purpose of this psa is to persuade people to join the peace corps. Learn about the peace corps. Travel and study overseas. Volunteer more frequently.

Two technicians are discussing how to test a car's exhaust by holding a small piece of paper within an inch of the tailpipe mouth. technician a says that if the paper is vibrating due to a "puffing" output from the tailpipe, this signals a smoothly running engine. technician b says that if the paper is being drawn toward the tailpipe, this could indicate burned exhaust valves. who is correct? a. technician b b. both technicians a and b c. technician a d. neither technicians a or b

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Explain how you might determine the rate of weathering on a sample rock