Answer:
14
Explanation:
It consists of 14 bones, which fuse to house the orbits of the eyes, the nasal and oral cavities, and the sinuses. The frontal bone, typically a bone of the calvaria, is sometimes included as part of the facial skeleton.
That's incorrect usage.
You'd say "I haven't seen him"
A. The verb tense is always present tense in this sentence unlike the others.