Answer: Answer is polonium aka C
Explanation: nickel damages your lungs and decreases your life span, but so does every other chemical in your question hope this helps
He probably suffers from OCD (Obsessive Compulsive Disorder) because he is experiencing obsessive thoughts (His fear of germs) and compulsive actions (excessive handwashing)
Answer: Oh i took the test.
The answer is you could cut the wrong vein and include death.
The correct answer is this one: "human industrialization." Air pollution comes from human industrialization. Because of too much industrialization, there are a lot of excess and wastes in any form: air or even liquid and solid wastes.
