Question

identify the bones indicated at xscapulatibiafibularadiusulnaquestion 21

Explanation:

For the first question (top skeleton): The 'X' marks the thicker, lateral bone of the forearm, which is the radius. Scapula is a shoulder bone, tibia and fibula are leg bones, and ulna is the medial forearm bone.
For Question 21 (bottom skeleton): The 'X' marks the bone of the upper chest wall that forms the rib cage's anterior and lateral structure, which is the rib (specifically a rib in the thoracic cage; note: if we match to typical options, this is a rib, but since the first question's options are provided, focusing on the first clear question: the top 'X' is radius.

Answer:

First question: D. Radius
Question 21: (Assuming standard skeletal identification) The bone at 'X' is a Rib (thoracic cage bone)