Answer:
=> C. ribs
Explanation:
=> The appendicular skeleton is composed of the bones of the <em>pectoral</em> <em>limbs</em> (arm, forearm, hand), the <em>pelvic</em> <em>limbs</em> (thigh, leg, foot), the <em>pectoral</em> <em>girdle</em>, and the <em>pelvic</em> <em>girdle</em>.
=> Ribs is a part of the axial skeleton.
Cells at Work (Hataraku Saibou)
The three principal organs of seed plants are roots, stems, and leaves. Roots: absorb water and dissolved nutrients. anchor plants in the ground.