Virus and bacteria are small and can cause problems
Fitness walking. n. The aerobic sport of brisk, rhythmic, vigorous walking, intended to improve cardiovascular efficiency, strengthen the heart, control weight gain, and reduce stress.
Pimple form from the excess oil accumulated in the spores.
The 2nd and 3rd one are both correct. I don’t know if it’s multiple choice or not, but the nervous system does both of those answers
I would say the teen doesn't think of the consequences that not having good health habits maybe affect them in their life later on. Also maybe the parents don't encourage them to live a healthier life.