Help 7
Every night, the average human body experiences an increase in melatonin levels, and then every day the levels decrease.
Is this an example of a periodic event? Explain
Yep....periodic
If we modeled the levels by a continuous curve....we would have an up/down/up/down pattern
[ A curve that "rises" and "falls" from left to right and repeats this pattern, over and over ]
+4116 
