A change in the sequence of bases in a DNA molecule is know as

A point mutation is a change in the base sequence of a DNA molecule.

Explanation:

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A change in the sequence of bases in a D.N.A. molecule is known as a mutation.

That's the answer.

Now, the thing that causes these changes is

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any abiotic or biotic factor in an ecosystem that causes a population's size to slow or decrease is a limiting factor.

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.