This brain injury causes symptoms such as headaches, dizziness and difficulty concentrating that usually improve within days to weeks.
3: immune system
4: antigens
1: not sure but maybe T-cell
2: how germs get inside our bodies
C strict low calorie diet
I would say peer pressure is the biggest reason for teenagers to engage in risky acts because everyone wants to be cool around friends and most of the time they always say "yes" instead of "no", even if it's a wrong decision. Hope it helps :D
