Problem: Which of the following situations describe a positive nitrogen balance? Check all that apply. Check All That Apply A healthy male college student who is maintaining his weight. A healthy male college student who is maintaining his weight. An adult who gains two pounds of muscle after lifting weights regularly for three months. An adult who gains two pounds of muscle after lifting weights regularly for three months. An adult who is ill with a high fever, on bed rest, and has a poor appetite. An adult who is ill with a high fever, on bed rest, and has a poor appetite. A twelve-year-old girl who recently grew one inch taller. A twelve-year-old girl who recently grew one inch taller. A healthy pregnant woman who is gaining the appropriate amount of weight.