C: More children are being born worldwide
A lot of caffeine if you don't wanna ruin your lungs, vaping and smoking are stress relievers and I heard that it helps with homework but since I'm a xc runner that wouldn't be very good on my lungs and I don't recommend it.
Identify patterns in your life. Once you've got a handle on what codependency actually looks like, take a step back and try to identify any recurring patterns in your current and past relationships.
Those two are the muscular system and the excretory system because you use your muscles to push up and down and your excretory system produces the sweat you use while doing them