According to the video, why did the mayan empire fall?

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

Why has there been such a large increase in theft and other crimes in the u.s

Which early modernism trend in art focused on prehistoric or exotic cultures? a. primitivism b. expressionism c. impressionism d. total serialism