Final answer:
The statement that the pharynx contains the structure that makes vocal sounds possible is true. The pharynx leads to the larynx, which holds the vocal cords necessary for producing sound.
Step-by-step explanation:
a) True. The pharynx is a crucial part of the respiratory track that interacts with the digestive system as well. It is the area that air passes through on its way to the larynx, where the vocal cords are located. These vocal cords are essential for producing vocal sounds.
When we breathe in, air moves through the nasal cavity to the pharynx and then to the larynx. The larynx, which is commonly known as the voice box, contains the vocal cords. These cords are able to vibrate due to the air that flows over them. The vocal cords are folded tissues that produce sound when they vibrate, which is the basis for our ability to speak. The size and tension of these folds vary among individuals, and contribute to the different pitches and tones of human voices.