Julianne does not smoke, but several of her friends do. they respect julianne's choices and don't pressure her to smoke, but julianne wants to ask them to stop smoking when they're with her. what should she let them know?
secondhand smoke has no negative effects.
secondhand smoke can cause liver damage.
secondhand smoke can cause lung disease.
secondhand smoke can cause birth defects

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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

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