*** I don't need help answering the questions... I need help with what to use as the object(s) to create the sound.***

Find a hollow object which can produce the specific source types listed below. Provide detailed explanations of the model's sources as indicated. Assume your model is a human oral cavity.

1. Demonstrate your object producing each of the 4 source types.
   1. Internal: a source of sound that is inside but not attached to the object
   2. External: a source of sound that comes from outside but not attached to the object
   3. Air: a source made by the passing of air through, into, or around the object.
   4. Combination: Using your Air source in conjunction with Internal OR External