Organ system. The blood vessels, blood, and the heart are organs which work together to form the circulatory system.
I dont think it's a bed bug I feel like it's a rat or something but good luck
I believe teens definitely are most concerned about muscular strength. They are more worried about that because they want to protect themselves, impress others, sometimes kids just want to bulk up to not look so wimpy, etc.
I would have to say teens are less worried about flexibility because when you have mussels why worry about doing the splits or putting your leg up to your head. One thing will always distract you from the rest.
You should check if you friend have oral herpes aand if he does them go to the octor
The answer u r looking for is-B sweating, hope this helped :)