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vertebra
The Vertebral column (singular: vertebra) are the inividual irregular bones that make up the spinal column (aka ischis) — a flexuous and flexible column common to all Vertebrates.
Trivia about vertebra
(Sarah of the Clue Crew shows some anatomical diagrams on the monitor.) Despite the vast difference in their heights, a human and a giraffe both have 7 of these bones in the neck, stacked one on top of the other