Instructions: Please use current (less than 5 years) peer-reviewed journal articles for references.

1. Explain why the source of drinking water is important to investigate in the assessment of an unusually high number of infertility cases in a community; in increased lead levels in children from a certain school; and in an outbreak of a gastrointestinal epidemic in a community.

2. Discuss the use of the epidemiological triangle in explaining the determinants of health.