Age-induced weakening of muscles and reduction in bone strength are compounded by the skin's diminished production of ________, which is required for effective calcium uptake. A) sebum B) vitamin B₁₂ C) vitamin D₃ D) vitamin A E) vitamin B₁

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Vitamin D is required for effective calcium uptake and utilization, making it crucial for maintaining bone strength. As we age, our skin's ability to produce vitamin D decreases, which can further exacerbate age-related declines in muscle and bone health.

Age-Induced Weakening of Muscles and Reduction in Bone Strength Are