Final answer:
Homeostasis is the characteristic of life demonstrated by Jim's sweating and subsequent lack of sweating once he returned to his air-conditioned room.
Step-by-step explanation:
Homeostasis is the characteristic of life demonstrated by Jim's sweating and subsequent lack of sweating once he returned to his air-conditioned room. Homeostasis refers to the ability of living organisms to maintain stable internal conditions despite changes in the external environment. In Jim's case, his body was sweating to regulate his temperature and cool him down while playing soccer in the hot weather. Once he returned to an air-conditioned room, the temperature became more stable, and his body no longer needed to sweat.