Final answer:
The mandible is the bone that works together with the maxilla in the process of chewing. It forms the lower jaw, is capable of movement, and is essential for masticating food.
Step-by-step explanation:
The bone that functions together with the maxilla in chewing is the mandible.
The mandible, also known as the lower jaw, is the only moveable bone in the skull critical for the mastication process.
The maxilla, complementing the mandible, forms the upper jaw, part of the hard palate, and provides sockets for the upper teeth, while the mandible holds the lower teeth and enables the chewing action by moving against the maxilla.
None of the other options function in chewing: the sphenoid bone, occipital bone, temporal bone, and ethmoid bone have roles in other structural and protective capacities in the skull.