What is the nature of sound waves in air?

What is the name of the strings which vibrate in our voice box when we talk?

Name the device which is used to produce sound in laboratory experiments.

What conclusion can be obtained from the observation that when the prongs of a sound making tuning fork touch the surface of water in a beaker, the water gets splashed?

State whether the following statement is true or false:

Sound produced by a vibrating body travels to our ears by the actual movement of air.