human skeleton spine bone anatomy illustration |
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| navigate by keyword : human skeleton spine anatomy illustrar illustraration spinal column defining synapomorphy shared vertebrates moderately flexible series vertebrae constituting characteristic irregular bone complex structure composed secondarily hyaline cartilage boanatomy polymorphous aline |
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| The spinal column, a defining polymorphous shared by nearly all vertebrates is a moderately flexible series of vertebrae each constituting a characteristic irregular bone whose complex structure is composed primarily of bone, and secondarily of Aline cartilage. |
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