If you don't know how that kind of thing works, you are likely to make mistakes regarding it. If you know how it works, you can prevent yourself from making mistakes that could endanger yourself and/or others.
Answer:
The thymus lies in the chest behind the breastbone and above the heart. Relatively large in infancy, it increases in size until puberty and thereafter shrinks to only a few grams in old age.
Explanation:
Some of your friends could help you regard tobacco. other friends wouldn't want you to stop <span />
Crunches or sit ups are good methods to strengthen the abdominal muscles
