Question

match the spinal column segment with the appropriate description.

shifts forward, acting as a shock absorber, when sitting
cervical

is the smallest and most mobile part of the spine
lumbar

acts to support and stabilize the weight of the upper body
sacral

consists of five fused vertebra that form the back wall of the pelvis between the hips
coccyx

Explanation:

Analyze the coccyx description

Using the Spinal Column Anatomy and Vertebral Column Regions knowledge points:
The coccyx (tailbone) shifts forward when sitting to act as a shock absorber.

Analyze the cervical spine description

Using the Spinal Column Anatomy and Vertebral Column Regions knowledge points:
The cervical vertebrae are the smallest and most mobile part of the spine.

Analyze the lumbar spine description

Using the Spinal Column Anatomy and Vertebral Column Regions knowledge points:
The lumbar spine supports and stabilizes the weight of the upper body.

Analyze the sacral spine description

Using the Spinal Column Anatomy and Vertebral Column Regions knowledge points:
The sacrum consists of five fused vertebrae forming the back wall of the pelvis.

Answer:

Description	Spinal Column Segment
Is the smallest and most mobile part of the spine	Cervical
Acts to support and stabilize the weight of the upper body	Lumbar
Consists of five fused vertebra that form the back wall of the pelvis between the hips	Sacral