Answer: going to bed at different times each night
Explanation: To keep the body to understand what is going to happen, by getting enough sleep without messing up the body pychologicly, it allows the body to adjust its internal clock.
Answer:
D - capable of both change and stability
Explanation:
Edg2020
Measure your heart rate before, during and after work outs and write it down. Monitors can be worn as a strap across the chest, on the wrist and even on the head, and by measuring your heart rate can help you exercise at the right intensity. Most don't have a display, so you'll need to connect your monitor with a sports watch or smartphone app to see your heart rate.