Why are some barriers in avoiding alcohol, drugs and tobacco?

Which term defines one's age as measured in years? chronological age biological age social age mental age

According to proper standing posture, from a side view, which parts of the body should be aligned? a. ear, shoulder, hip, knee, and ankle b. stomach, hip, knee, and ankle c. nose, shoulder, hip, knee d. ear, shoulder, fingers, ankle

For yokos physical fitness class she is supposed to do a certain amount of aerobic exercise what is best for her