It would be Alcohol, any drug use,eating unhealthy, smoking,lack of working out, lol basically having intercourse at a young age without any protection, also unintentional injuries or violence.
P.s to prevent most of these all you need to know is right and wrong and if you know these thing can have consequences then don't do them also keep your legs closed , for one of them its important to work out every now and then
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Teens should do more moderate physical activity to help them stay healthy because th less they are active the harder it is for them to actually get up and move. It also helps with hand and eye coordination along with motor skills.
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Answer:
metabolism, mood, reproduction.
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