Human thigh bones as strong as what?
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Steel
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Aluminim
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Plastic
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Concrete
D
Correct answer
Explanation
The femur (thigh bone) is exceptionally strong and can withstand similar compressive forces to concrete - roughly 1,700-2,000 psi before fracturing. Steel is much stronger, while plastic cannot compare. The bone's strength comes from its dense cortical structure and unique collagen-hydroxyapatite composition.