<span>Using performance-enhancing drugs has various long-term
effects that includes worsening acne, impotence, balding, stunt growth in
adolescents, increased risk of blood clot and more serious effects such as
heart and liver damage. When the liver
is impaired, it can result to swelling of legs, arm and abdomen, worst case is
jaundice. Meanwhile, damage heart will lead to increase risks of high blood
pressure, heart attack and stroke.</span>
It is a Spreading disease.
The answer is C. using your head
<u>Answer:</u>
The factor that contributes to aging is: A Cells stop dividing after 50 divisions.
<u>Explanation:</u>
- Normally after 40 to 50 divisions the cells stops dividing because they had already lost too much DNA for other divisions.
- So they eventually die, making the appearance like an aged person in any individual.
- As DNA is copied in every cell division process, they tend to loose small part of telomeres in each transfer process.
- Hence, after 50 divisions these cells fails to divide resulting in aging.
