Nonpoint sources of pollution a. include smokestacks and automobile exhaust pipes b. are more difficult to control than point sources c. are cheaper and easier to identify than point sources d. enter ecosystems from single identifiable sources

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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.