The bones that form the floor of the nasal cavity are the and of the maxilla bone.

The answer is: horizontal plate of palatine bone and palatine process of the maxilla bone.

Explanation:

The nasal cavity is the bilateral air-filled space present above the roof of the mouth and behind the nose, that forms the interior of the nose.  

The hard palate forms the roof of mouth and floor of the nasal cavity. The bones of the hard palate that are present on the floor of nasal cavity are the horizontal plate of palatine bone and palatine process of the maxilla bone.

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