Explain the gravitational force the Earth has with the moon.

well, you see. the answer to your question is quite simple. the thing that is big, powerful, and over 9,000 is your mom.

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.