Which of the following is the most likely reason that a pop of mice in a farming area suddenly increases?
a)more mice immigrate from neighboring areas
b)fewer mice emigrate to neighboring areas (i don't think it's this one)
c)more food is available as grain is harvested
d)more nesting space is available as new barns are constructed

answer: c.

explanation:

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.