Answer:
DNA changes caused by mutagens may harm cells and cause certain diseases, such as cancer. Examples of mutagens include radioactive substances, x-rays, ultraviolet radiation, and certain chemicals.
Explanation:
It would be A because when you are younger you want to have a higher heart rate while working out.
Answer:
Danger Zone: Never leave food out of refrigeration over 2 hours. Source: USDA
I don't think so but I'm not positive. I know my dad had exposure to secondhand smoke and he's fine. :) Hope this helps!
The answer is A. department of health and human services
