Final answer:
The maxilla is the odd one out among the options (humerus, femur, radius, and maxilla) because it is a bone of the facial skeleton, not involved in limb movement unlike the other three bones.
Step-by-step explanation:
The question involves identifying the odd one out among a list of bones: humerus, femur, radius, and maxilla. The humerus, femur, and radius are bones that are part of the upper limb, forearm, and lower limb, respectively. These three bones articulate with other bones at joints and are associated with limb movement. The maxilla, however, is a bone of the facial skeleton and does not articulate for limb movement. Therefore, the odd one out in this list is the maxilla because it is not involved in articulation for limb movement like the other three bones.