Your friend is tutoring someone for Chemistry class while you are trying to read your newest Manga "Zom 100: Bucket List of the Dead." They are being loud and you overhear her explaining the picture above. You hear her say, "sections 2 and 4 are where no kinetic energy is being added because the temperature isn't rising." You quickly jump in to correct her. What do you tell the student she is tutoring about what is actually happing in sections 2 and 4 of the graph above?