Enzymes act like in their role of speeding up reactions.
a water
b ph
c heat
d acid

Enzymes act like (C) heat, as they are both catalysts

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.

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