In the story "The Law of Life" by Jack London what is the parallelism expressing?

In the story, the parallelism of the dead of Old Koskoosh, old moose and old men means all things on earth must follow the same law. Life gives both men and animals different roles, but when all is said and done, everything eventually dies. The "law of life" and life itself can be wonderful but at the end the "law of death" must be obeyed. That is why Old Koskoosh gives in to the wolves at end of the story. He remembers leaving his own father on the ice and realizes it is time for him also to die.