12. Which body system is responsible for receiving information from the environment and generating voluntary and involuntary
responses?
A. Reproductive System
B. Immune System
C. Excretory System
D. Nervous System

the answer is b: 1.4 km/hr

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.