Why is it important to thin the blood of someone having a heart attack, but not for someone having a stroke? a. strokes are not a cardiovascular disease and are not impacted by blood pressure. b. thinning the blood will cause arteries to relax and allow blood to pass more easily. c. for a stroke, it is necessary to control and stop the bleeding in the brain. d. blood thinners are only useful for treating coronary heart disease.

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