Question

1. which of the following is the combining form meaning \upper arm bone\?

tibi/o
fibul/o
humer/o
femor/o

Explanation:

The combining form "humer/o" specifically refers to the humerus, which is the upper arm bone. "Tibi/o" relates to the tibia (shin bone), "fibul/o" to the fibula (a bone in the lower leg), and "femor/o" to the femur (thigh bone).

Answer:

humer/o