Final answer:
Tom Sawyer and Huck Finn stop up the rat holes in the basement to make up for the trouble they caused Uncle Silas in 'The Adventures of Huckleberry Finn'. This act serves as their way of trying to rectify their earlier mischief. Jim's involvement in this act is not detailed in the text.
Step-by-step explanation:
In Mark Twain’s novel, "The Adventures of Huckleberry Finn", Tom Sawyer and Huck Finn feel remorse for letting Uncle Silas shoulder the blame for the missing objects they themselves had taken during their plan to free Jim. As a means to make amends, Tom and Huck decide to stop up the rat holes in the basement to help Uncle Silas, who was convinced that rats were responsible for the missing items.
The task they undertake to fix the rat holes is seen as a small act of restitution for the trouble and confusion they caused. It is not specified in Chapter 37 whether Jim participates in this particular effort to compensate Uncle Silas.
This act of sealing the rat holes shows their remorse and willingness to take responsibility for their actions.
However, Jim, who is a runaway slave, does not go along with Tom and Huck in this particular act of making up for their mistake. Jim is focused on his own escape and does not participate in sealing the rat holes.