If more snakes moved into this environment, then A. the number of rabbits would go up.
B. the number of grasshoppers would go up.
C. the number of toads would go up.
D. The number of hawks would go up.

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B. The number of grasshopers would go up.

Explanation:

A. is incorrect because it would decrease

C is incorrect  because it would also decrease

D is incorrect because snakes dont eat Hawks, but Hawks eat them

B is correct because since snakes would eat the toads, there would be no toads eating grasshoppers

Hope this helps!!!

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.