As mixed-doubles teammates in tennis, Kara and Tran are trying to devise their best strategy against an opponent that has two excellent servers but, their physical fitness level is not as good as Kara and Tran's. How can Kara and Tran use their superior cardiovascular endurance to win the match? Use the entire court to place serve returns. Use a short drop shot when their opponents are close to the net. Use a long baseline shot when their opponents are far away from the net. All of the above

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