Final answer:
In the final chapter of The Call of the Wild, Buck's conflict between civilization and the wild shifts from an internal conflict to an external conflict through environmental challenges.
Step-by-step explanation:
In the final chapter of The Call of the Wild, Buck's conflict between civilization and the wild shifts from an internal conflict to an external conflict through environmental challenges. Throughout the novel, Buck has struggled with his natural instincts conflicting with the expectations and demands of civilization. However, in the final chapter, Buck is faced with harsh environmental challenges that force him to fully embrace his primal instincts and abandon civilization.