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The backbone is definitely not a single bone, but is made up of small bones known as vertebrae. |
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The backbone is not a single bone at all, but a series of small bones and vertebrae. |
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Though the backbone seems like a single bone it is not so; it is made up of a series of small bones called vertebrae. |
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Actually the backbone is not a single bone but a series of small bones known collectively as vertebrae. |
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The small bones that make up the complex backbone are collectively known as vertebrae. |