Which one of the following are painkilling chemical that occur naturally in your body?

This is first hand knowledge, top-level athletes, successful business people and achievers in all fields all  set goals. setting  goals  gives you long-term vision and short-term motivation . it focuses your acquisition of knowledge, and you to organize your time and your resources so that you can make the very most of your life.

Excessive consumption of natural foods has no effect when ,dietary foods does.they are bad in lower cholesterol and higher in good cholesterol.

The answer is replication