4.Which of the following is a major limitation of an electron microscope? of the following is a major limitation of an electron microscope? A. It only works in a vacuum and cannot view living things.
B. It is cheap.
C. It is small and easily moved.
D. It can view only living things.

well, that's easy; the answer's c, "it reduces contamination of the water and substrate of the estuary."

sheep is a herbivore animal whereas grasshopper belongs to the class chordates but both of them feed on greens.  

if grasshopper and sheep feeding on a pasture land, i do not think both of them will have any impact on each other. however, the number of the species can make difference. since sheep feed on greens, there is a possibility there left no pasture land for the grasshoppers or they may get extinct.

multiply it by 5 in order for you to understand i cant give an exact answer.