Cholesterol is the waxy substance found in the blood stream. Too much of it can cause diseases like Heart Disease, Diabetes, High Blood Pressure, etc.
The spinal cored is a long bundle of nerve tissue, It receives messages and sends it to the rest of the body. This is apart of the Nervous System
Answer:
The strategies that can aid in leading a substance-free life are:
* Building a strong relationship with your parents
* Choosing friends who do not use drugs
* Being a positive role model for others
* Finding activities you can enjoy without drugs