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A person living close to the North Pole fractures a bone in December. She finds that it takes an unusually long time to heal. Which best explains why this might occur?a. Decreased exposure to the Sun results in more calcium released by the skin.b. Decreased exposure to the Sun results in less vitamin D produced by the skin.c. Greater exposure to cold results in softer bones.d. Greater exposure to cold results in bones that are brittle.

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