Cigarettes can contain over 4000 chemicals. With that 4000, there are 43 cancer causing chemicals and 400 other toxins such as nicotine, tar, carbon monoxide, and much more.
Gases- Oxygen, hydrogen, carbon monoxide, nitrogen
Answer:
B. The top epidermal layer
Explanation:
Like most, if not all skin cancers start at your epidermis (The layer of skin that's most exposed to the sun) The cancer begins in your basal cells where they constantly push older skin cells toward the surface of your body.
Cell structure over time is known as a free radical
Answer: Yes the ozone layer sits at the top to protect us from harmful UV rays from the sun.
Explanation: