Which of the following is NOT true of the curvatures of the vertebral column?
A. The thoracic and sacral curvatures are convex on the anterior side and concave on the posterior side.
B. The cervical and lumbar curvatures are secondary curvatures.
C. There are four curvatures of the vertebral column.
D. Primary curvatures are formed by the time of birth.
E. All of these are true of the curvatures of the vertebral column.
Answer: A
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