Answer:
because it’s optional
Explanation:
some people have diseases or something that they have to be real careful about
Answer:
Research the cause of cancer
Explanation:
The definition of epidemiologist is "scientists who study diseases within populations of people."
This would be Carbon Dioxide.
Answer:
The athlete's foot is a type of fungal skin infection. Fungi (the plural of fungus) are microscopic plant-like organisms that thrive in damp, warm environments.