Introduction to the dependence of life and death: The dependence of life and death refers to two pine trees. They grow on a hanging rock. One tree has no green leaves on its branches and is already dead, while the other tree has lush branches and leaves and is full of vitality. The strange thing is that this dead pine tree has experienced many years of wind and rain but has not withered. It is tightly attached to the living pine tree! Life and death depend on each other!