Final answer:
p53 triggers apoptosis to eliminate damaged cells in a multicellular organism.
Step-by-step explanation:
When certain cell cycle events fail, the protein p53 can trigger apoptosis, which is programmed cell death. This regulatory outcome benefits a multicellular organism by eliminating damaged cells. By removing cells that are potentially harmful or incapable of functioning properly, apoptosis helps maintain the overall health and functionality of the organism.