Question

what is the term for air - filled cavities within skull bones that reduce the weight of the skull and affect the sound of the voice?
foramen magnum
nasal conchae
auditory ossicles
paranasal sinuses

Explanation:

Paranasal sinuses are air - filled cavities in skull bones. They lighten skull weight and influence voice resonance. Foramen magnum is a large opening in the base of the skull for the spinal cord. Nasal conchae are bony projections in the nasal cavity for filtering, warming, and humidifying air. Auditory ossicles are small bones in the middle ear for sound transmission.

Answer:

D. Paranasal sinuses