True or False: Buck's wolf brother exists in his dreams about the caveman.

In "The Call of the Wild," Buck's wolf brother does not exist in his dreams about the caveman. Instead, his dreams often reflect memories and instincts tied to his ancestral past, including experiences of survival and the call of the wild. The concept of a wolf brother is more symbolic and ties into Buck's deepening connection to his primal instincts as he becomes more attuned to the wilderness. This understanding of his heritage and instinctual drive is not depicted as a literal entity that appears in his dreams, but rather as an underlying theme that influences his evolution throughout the story. Thus, the notion that Buck's wolf brother exists in his dreams does not hold true within the context of the narrative.