Final answer:
True. The addition of calcium to the bone's matrix during ossification leads to rigidity, strength, and support of the skeleton.
Step-by-step explanation:
During ossification, which is the process of bone formation, calcium is added to the bone's matrix. This addition of calcium helps to create hydroxyapatite crystals, which give bones their hardness and strength. The collagen fibers in the bone matrix provide flexibility, preventing the bones from being too brittle. Therefore, the addition of calcium to the bone's matrix during ossification leads to rigidity, strength, and support of the skeleton.