As people enter old age, some of the changes the body undergoes includes:

a. deteriorating eyesight
b. decreased strength
c. less flexibility
d. all of the above

true dat because you don't physically and emotional stress

exposure to hazardous carcinogens and toxic substances can cause breathing problems, such as copd and various types of cancer. it also increases the risk of heart attacks and strokes and has serious (but no less unattractive) side effects, such as aging, yellow teeth, a terrible smell and damage to the vocal cords.