What part of the trachea allows animals to speak or make sound?

The larynx, also known as the voice box, is the part of the trachea that allows animals to speak or make sound. It is located at the top of the windpipe and contains the vocal cords, which are two bands of tissue that vibrate when air passes through them. The vibration of the vocal cords creates sound waves, which are then amplified by the resonating chambers of the throat and mouth.