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Humans are born with approximately 300 bones, but as we age, some of these bones fuse together, resulting in an adult human having around 206 bones. This process typically begins during puberty and continues until early adulthood. The 3 main categories of bones in the human body are axial, appendicular, and flat bones. Axial bones make up the skull, spine, and ribcage, while appendicular bones include the upper and lower limbs. Flat bones, as their name suggests, are flat and often provide protection for organs such as the chest and abdominal cavities.