You need to post an image with it, this is much too vauge without it.
Density is defined as mass divided by volume, therefore: 100g/25cm3 = 4 g/cm3
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Other common conditions that affect the skeletal system include: Osteoporosis: This is a disease in which the bones become fragile and prone to fracture. Leukemia: This is a cancer of the white blood cells. Osteopenia, osteitis Deformans, and osteomalacia: Similar to osteoporosis, these are other types of bone loss
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