Which structure divides the nasal cavity into right and left cavities?Multiple choice question.frontal sinushard palatenasal septumsoft palate

The structure that divides the nasal cavity into right and left cavities is the nasal septum.

Explanation:

1. Nasal Septum: It is a vertical partition that separates the nasal cavity into two halves, effectively creating the right and left nasal passages.
2. Frontal Sinus: This is an air-filled space located within the frontal bone, above the nasal cavity, but it does not divide the cavity.
3. Hard Palate: This is the bony structure forming the roof of the mouth; it separates the nasal cavity from the oral cavity but does not divide the nasal cavity itself.
4. Soft Palate: This is the soft tissue located at the back of the roof of the mouth, which also separates the nasal cavity from the oral cavity but is not a divider of the nasal cavity.

Therefore, the correct answer is nasal septum.