Question

which of the following bones is unpaired?
parietal
temporal
frontal
zygomatic

Explanation:

To determine the unpaired bone, we analyze each option:

• Parietal bones are paired (two, one on each side of the skull).
• Temporal bones are paired (two, one on each side).
• Frontal bone is a single (unpaired) bone forming the forehead region of the skull.
• Zygomatic bones (cheekbones) are paired (two, one on each side).

Answer:

Frontal (the option labeled "Frontal")