1. 40.4 The Environment and Your Health

2. Risk Factor Anything that increases the chance of disease or injury.

3. Tumor Mass of growing tissue.

4. Carcinogen Chemical compound known to cause cancer.

5. Key Concept Environmental factors that can affect your health include air and water quality, poisonous wastes in landfills, and exposure to solar radiation.

6. Key Concept Healthful behaviors include eating a healthful diet, getting plenty of exercise and rest, abstaining from harmful activities, and having regular checkups.