The answer is: "social epidemiology" .
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" <u> Social epidemiology </u> i<span>s the study of the causes and distribution of health, disease, and impairment throughout a population."
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When a sperm and an egg are combined they create a zygote.
Answer:
because of pollution and less good environment
Answer: <u> 2</u> <em>should be the answer</em>
