Bones are curious structures. Stronger than steel, bones at first glance appear to be hard, dead parts of the body. However, bones are living organs, and both contain and produce blood. Also, a bone is only rigid in an adult, when it has become fully calcified. A child's bones are partially calcified and partially cartilage, a substance that shares many properties with plastic.
Adult bones can best be described as a hard network filled in with softer tissue. Imagine a sponge made of concrete.
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