Why are Bones hard and muscles soft?

Why are Bones hard and muscles soft? Bingo Card
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This bingo card has 24 images and 24 words: cell, body, salivary glands, muscle tissue, esophagus, red blood cell, nucleus, tissue, cytoplasm, epithelial tissue, organ, intestines, digestive system, tongue, stomach, bone marrow, cell membrane, white blood cell, connective tissue, enzymes, epidermis, villi, brain and circulatory system.

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7A Cells | Cells to Body Systems | Human Body and Genetics | sCiEnCe | Bingo :D

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