CAN YOU HEAR THAT!

1. ultrasonic means a sound at frequencies higher than the human hearing range-over?.......
2. why do you have to be careful when you listen to music with head phones?
3. the sound waves hit the ear drum, a membrane at the end of the ear canal which?......
4. only people under the age of 20 can hear sounds over 17,000 Hz (17 kilohertz or 17 kHz) How much sounds can and old person hear?.....
5. the inside workings of a dogs' ears are actually a lot like humans'. However, dogs hearing is much more?......