The movement of a plant's leaves to face the sun as it moves across the sky is an example of
a. phototropism.
b. solar tracking.
c. heliotropism.
d. nastic movements.

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.