Answer:
Step-by-step explanation:
The sentence from the excerpt that best supports the idea that the muskrat was willing to sacrifice himself for the good of all is:
"After a lengthy amount of time, he drifted to the surface with a tiny speck of earth in his hand. He appeared to be dead. . . ."
This sentence shows that the muskrat went to the bottom of the ocean and stayed there until he was able to bring back a tiny speck of earth. The fact that he appeared to be dead when he resurfaced suggests that he may have exerted himself to the point of exhaustion to complete his task, indicating that he was willing to sacrifice himself for the good of all.