Final answer:
Autolysis is an example of pre-embalming chemical change in a body, which involves the breakdown of cells and tissues by enzymes released by the body itself before death.
Step-by-step explanation:
The example of pre-embalming chemical change in a body is autolysis. Autolysis refers to the process of self-digestion that occurs in a body after death. It involves the breakdown of cells and tissues by enzymes that were released by the body itself before death. This chemical change leads to the decomposition of the body.