Which Would Not Be Classified as an Irregular Bone

Question

Which would not be classified as an irregular bone?
A)Scapula
B)Sphenoid
C)Sacrum
D)Thoracic vertebra
E)Ethmoid

Accepted Answer

The scapula, or shoulder blade, is classified as a flat bone due to its broad and flat surface, which is distinct from the complex shapes of irregular bones like the sphenoid, sacrum, thoracic vertebra, and ethmoid.