Which area of the spinal column is subject to the greatest mechanical stress and degenerative changes

Lower lumbar

Explanation:

The spinal column is refered to as the vertebral column and it's the central axis of skeleton. It supports the trunk, provides attachments to muscles, and helps in the protection of the spinal cord.

The area of the spinal column that is subject to the greatest mechanical stress and degenerative changes is Lower lumbar.

c.) polymerase chain reaction

- "unlike the original dna fingerprinting method, dna profiling does not use restriction enzymes to cut the dna. instead it uses the polymerase chain reaction (pcr)? to produce many copies of specific str sequences. pcr is an automated procedure that generates lots of copies of a specific sequence of dna."

tissue

explanation:

it is actually formed by geoup of cells which is tissue