Which of the following statements about tobacco use is TRUE? a. Tobacco use has been linked only to lung cancer.
b. Smoking tobacco is dangerous; chewing it or dipping snuff are safe.
c. To minimize the risk of lung cancer, smoke “light” cigarettes.
d. About 30% of all cancer deaths are related to tobacco use.

Describe the potential effects, on people, of unprotected exposure to the sun.give an example of 1 new thing have you learned about the sun’s uv rays.

Why would one lymph node in the neck be swollen and not the other? what causes them to swell?

You isolate an infectious substance capable of causing disease in plants, but you do not know whether the infectious agent is a bacterium, virus, viroid, or prion. you have four methods at your disposal to analyze the substance and determine the nature of the infectious agent.i. treat the substance with enzymes that destroy all nucleic acids and then determine whether the substance is still infectious.ii. microscope.iii. culture the substance on nutritive medium, away from any plant cells.iv. treat the sample with proteases that digest all proteins and then determining whether the substance is still infectious.if you already know that the infectious agent was either bacterial or viral, which method(s) listed above would allow you to distinguish between these two possibilities? a) ib) iic) ii or iiid) iv