Is this right?
I think there all prime numbera.

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

Write a short letter to an imaginary friend. tell him or her how you feel about substance abuse. suggest at least 2 (two) alternatives that will you friend relieve the tension or anxiety he or she feels. give an example of one way the friend can get if they need to get .

The acts as the internal clock that controls sleep and waking cycles. a. hypothalamus b. pineal gland c. ovaries d. thyroid