Assertion: radon's level | /r/Causes | lung cancer
Facets:
Source sentences:
text: Now, better research has made two things clear: Elevated levels of radon over a long period of time can cause lung cancer, and there are effective ways to reduce these levels.
text: Now, better research has made two things clear: Elevated levels of radon over a long period of time can cause lung cancer, and there are effective ways to reduce these levels.