Why does the man go to the Great Tree at the beginning of the myth on the world on the turtles back?

In the myth "The World on the Turtle's Back," the man goes to the Great Tree to gather roots and fulfill a task for his pregnant wife, who craves the roots’ medicinal properties. The Great Tree is significant as it symbolizes life and the connection between the spiritual and physical worlds. The man's actions set the stage for the events that follow, including the creation of the earth and the eventual emergence of duality in the world.