One evolutionary trend is that as you move from simpler animals to more complex animals a- systems become more specialized b- systems become less specialized c- organs become less specialized d- cells become less specialized need !

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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.