why are bones hard
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why are bones hard
why are bones hard and muscles soft
why are my bones so hard
bone is hard in nature why
what makes a bone hard
why bone tissue is hard
what two things make bones hard
how hard are bones
explain why bone tissue is hard
what makes bones hard and rigid
can bones get harder
why are my bones so big
what makes bone tissue hard
can you make your bones harder
why do my bones break so easily
bones receive their hardness from
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