NEED HELP HERE, PLEASE

1. Your ear changes the vibration of sound waves into signals. The signals are then interpreted by your brain. A. True B. False

2. ______means to move back and forth quickly.
A. Pitch B. Amplitude C. Vibration D. Echo

3. An ________ is a reflected sound.
a. A. Vibration B. Pitch C. Echo D. Volume

LASTLY
Why is sound vital to humans? What is the purpose of music in the society?

THANKYOU IN ADVANCE