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  Older people suffer more broken bones than younger people because the mass and strength of bones decrease with age. There is no single reason why this occurs, or why some individuals and populations are more (1) ---- than others. Like other complex traits, age- related changes in bones result (2) ---- interactions between environmental and genetic factors. Scientists have linked changes in bone strength to (3) ---- in physical activity, the levels of dietary calcium and vitamin D, and [...]

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