The graph illustrates how a person’s body temperature varies with time. What could explain the changes in body temperature during periods 1 and 2?
- Aperiod 1: reduced air temperature; period 2: increased air temperature
- Bperiod 1: reduced air temperature; period 2: shivering
- Cperiod 1: vigorous exercise; period 2: increased sweating
- Dperiod 1: vigorous exercise; period 2: shivering