Final answer:
The lumbar curvature and cervical lordosis are natural curves of the human vertebral column that provide strength, flexibility, and shock absorption.
Step-by-step explanation:
The lumbar curvature and cervical lordosis are both natural curves of the human vertebral column that provide strength, flexibility, and shock absorption. The lumbar curvature, also known as the lower back curve, develops as a child learns to stand and walk. The cervical lordosis, or the curve in the neck region, develops as an infant learns to hold their head upright when sitting. It is important to note that the lumbar curve is generally deeper in females.