Final answer:
White Fang's snarl is a manifestation of his defensive and aggressive instincts, which underscores his dual nature and struggle between the wild and domestic worlds in Jack London's novel.
Step-by-step explanation:
In the novel White Fang by Jack London, the purpose of White Fang's snarl is to convey his defensive and aggressive nature, a response honed by his wild environment and interactions.
The snarl of White Fang is symbolic, expressing his wilderness and survival instincts. In chapters 3 and 4, White Fang’s snarl is particularly special because it exemplifies the duality of his character, part dog and part wolf, and highlights his struggle between the domestic and wild world. It is a means of communication, showcasing his strength, establishing his dominance, or exhibiting fear.
This snarl encapsulates the raw essence of nature in London's story, contrasting against the characters of men and other domesticated animals.