Khalil has a flock of sheep that he has just paid the vet a huge amount of money to deworm. Within just a few months, Khalil’s sheep are once again infested with them. What can Khalil do to hopefully prevent the sheep from picking up worms after they are treated this time? A.
Put goats in the field with them because they will repel worms.

B.
Change their feed because that is where they are getting worms.

C.
Make sure that there is no standing water in their pasture that could contain protozoa.

D.
Change the pasture they are in because the first one is contaminated.

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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Signs of a sprain might include: a deformed appearance immobility a grinding sensation swelling