The graphs show some trends in deaths due to cancer in the United States. Study the graphs and answer these questions.

1. Using the 1973 chart, list in order the top four causes of death.

    

    

2. Using the 1996 chart, list the top four causes of death.

    

    

3. Deaths from which cause decreased the most between 1973 and 1996?

    

    

4. Deaths from which cause increased the most between 1973 and 1996?

    

    

5. What are some possible reasons for the increase in cancer deaths between 1973 and 1996?