A student builds a model of the heart and brain, shown in the student will label the trucks with what they are carrying.
trucks, 1 and 2, trave
rgans
The
Which set of labels BEST Completes the model?
A
Truck 1 carries oxygen and Truck2 carries carbon dioxide.
B)
Truck 1 carries carbon dioxide and Truck2 carries oxygen.
Truck 1 carries red blood cells and Truck 2 carries white blood cells.
D)
Truck 1 carries white blood cells and Truck 2 carries red blood cells.

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