How natural selection could lead to a change in the population

The specimens that are the best suited for their environment will survive and reproduce. This is to help ensure that the population will thrive and become better suited for their environment. It can affect the change by ensuring that the best possible breed of a given species will live, and the ones that aren't as suited for the environment will die out.

Srry for the long answer.

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.