Spend time observing or thinking about events that involve matter and energy. which events can you explain? which event's can't you explain?

Eating. Your muscles in your arms and mouth use energy to feed itself. Then your body digest the food which also takes energy.

Sleep. When your tired, you don’t have much energy. It is said that you use more energy while your sleeping. But how do you become energized if you were using even more energy than before?

The center is basically the heart of it