Diffusion is the movement of molecules from an area of high concentration of molecules to an area with a concentration. A. Equal
B. Higher
C. Lower
D. None of the above

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explanation:

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.