Which biological process takes advantage of chemical bonds

Anything that uses the properties of water is taking advantage of hydrogen bonding between the partially charged H2O molecules of water that allows for said properties(like cohesion, high temp of vaporization, universal solvent). Sweating is a great example of the human body using hydrogen bonding to get rid of heat energy through the natural breaking of those bonds with evaporation.

Explanation:

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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.