Problem
I. What are the possible effects of contaminated water on the health of an individual or community? Explain your answer in terms of what causes the contamination, the types of infectious agents involved in the related diseases, and how these diseases can spread.
II. Explain how heredity and family medical history can play a role in an individual's personal health. Include examples in your explanation.
III. People's choices can sometimes have negative effects on their own health, as well as the health or well-being of others. Describe two of these choices, explaining how they can impact the individual and others.