Two groups of students were tested to compare
their speed working
math problems. Eac
group was given the
same problems. One
group used calculators
and the other group
computed without
calculators

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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.