Help me out please!

the answer is c because it grabs carbon and turns it into oxygen which is what we breath

answer; ///i do believe that the correct answer is (c) hold atoms together to form compound;

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.