Final answer:
The excerpt from "White Fang" by Jack London features contrasting elements and a dark note, highlighting the challenges the characters face in the Arctic night.
Step-by-step explanation:
The excerpt from "White Fang" by Jack London highlights several contrasting elements. First, there is the contrast between the warmth and comfort of the cheery fire and the darkness and coldness of the Arctic night, creating a sense of isolation and danger. The word "launched" is used to describe the men's departure, emphasizing the sense of movement and adventure. The description of the men turning their backs on the fire signifies their determination to face the challenges ahead. Finally, ending the sentence on a dark note adds to the suspense and foreshadows the difficulties that lie ahead.