Ayden has been asked to wear a protective vest while his dentist takes an x-ray. why is this? x-rays are dangerous mutagens. x-rays are considered poisonous. x-rays are harmful chemicals. x-rays are a result of uv radiation.

X-rays are dangerous mutagens.

Explanation:

X rays are the potential mutagens which means that they can cause random changes in the DNA of organisms. X rays are ionizing radiations and produce the free hydroxyl radicals which in turn target the phosphodiester bond of DNA and leads to mutations.  

Ayden was told to wear the protective vest since a small exposure to X rays can serve as a cause of mutations. Wearing the protective gears would have prevented direct exposure of his body surface to the X rays. It would reduce the chances of any potential harmful mutations in Ayden.  

stress fractures occur largely in the feet and legs and are common in sports that require repetitive impact, primarily running/jumping sports such as gymnastics or track and field.

not sure if this what   you'r looking for would be percent composition