Final answer:
The purpose of the sinuses is to provide resonance for the voice and lighten the weight of the skull.
Step-by-step explanation:
The purpose of the sinuses is to create resonance for the voice and to lighten the weight of the skull. Sinuses are air-filled spaces located within the bones of the skull and face. They help humidify and filter the air we breathe, but their main role is to provide resonance to the voice, making it sound louder and richer. Additionally, the sinuses help lighten the weight of the skull, making it easier for us to hold our head upright.
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