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must answer all 3 with an explanation.

Which system revise and send electrical signals throughout the body

Which would be the most useful source of evidence to support mcneill's contention?

Which statement best describes how the loudness of the sound affects the high-pressure region created by the sound wave? a. a louder sound has no effect on the pressure created. b. a louder sound means a high-pressure region that is higher. c. a louder sound means a high-pressure region that is not as high.