Watch a Video:
Watch the video below and answer the following questions.
1. How long do red blood cells live? Skin cells? Colon cells?
2. By the age of 70, about how many new colons has a person had?
3. What is the one cause that unites all types of cancer?
4. Researchers discovered that what percentage of cancers in the U.S. were caused by DNA alone?
5. When researchers re-did their original analysis using data from more countries and more types of cancer, what did they find?