Answer: If a person is involved in risky behavior it can negatively impact their brain maturation because if you get a disease or get pregnant it can add stress to your body and if so your baby because you will have lots of questions to ask and decisions to make that will impact their life.
The answer to your question is (True)
Making it wrinkly and unpleasant shade sometimes
To be honest, I'm not that sure on which one it is, but given choices lead me to think is the nervous system, probably because that's the reason our bodies are functioning, and compared to all other systems, the brain and the nervous system are needed for survival, otherwise you wouldn't be living.
