Which sentence uses the past participle form of the verb draw?

a.
the artist had drew her sketches with a charcoal pencil.

b.
the artist had drawn her sketches with a charcoal pencil.

c.
the artist drew her sketches with a charcoal pencil.

d.
the artist is drawing her sketches with a charcoal pencil.

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.

it would be heredity