Which crustacean lives as an encrusting organism *

(A) barnacle

(B) lobster

(C) hermit crab

(D) copepod

a community that experiences major changes undergoes progress

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.

not sure if this what   you'r looking for would be percent composition