This was thought of as to lose heat. The Neanderthals lived in colder climates and had small nasal cavities.
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Paranasal sinuses drain into the nasal cavity.
The nasal cavity belongs to the respiratory system.
The nasal conchae are located inside the nasal cavity on both sides of the nose. They are bony structures covered in mucous membrane that help to increase the surface area in the nasal cavity, which helps to humidify and filter the air we breathe.
a tooth cavity
The ethmoid bone connects the orbit to the nasal cavity. It forms part of the side walls and roof of the nasal cavity, and also contributes to the medial wall of the orbit.