OR2M7 is among many olfactory genes that code for olfactory receptors which influence our sense of smell. Variations in this particular gene may be to blame for the unpleasant odor some people detect in their urine after consuming asparagus. For this smelly trait, DNA differences in the OR2M7 gene can be described as the

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.

the answer u all are looking for is 4000000000000000000000 million years.