Final answer:
In a positive nitrogen balance, the body is building more tissue than it is breaking down during growth periods like infancy, childhood, adolescence, and pregnancy.
Step-by-step explanation:
In a positive nitrogen balance, the body is building more tissue than it is breaking down. This is seen in times of growth (infancy, childhood, adolescence, pregnancy). This is called positive nitrogen balance. During periods of growth, such as infancy, childhood, adolescence, and pregnancy, the body requires more protein to support tissue growth and development. When the intake of protein is greater than the loss of nitrogen through urine and feces, the body is in positive nitrogen balance.