Central (CNS) & Peripheral (PNS)
PNS contains the Somatic (SNS) & Autonomic (ANS)
I'm not completely sure what you are talking about when you say "abstinent", but I am going to assume that you are talking about alcohol or any other unhealthy habits. If that is the case, then yes, being abstinent will help you prioritize other life goals and be more successful, so, the answer would be A. True.
I hope this is helpful! :D
Answer:
Genetics, biological and environmental factors
Explanation:
The skeletal system is what provides the body with a framework that is strong and mobile.