Almost all living organisms use the same basic biochemical molecules including blank

Including DNA, ATP, and many identical or nearly identical enzymes.

Explanation:

All living beings are made up of cells and although the structures of an animal cell are different from a plant cell, which in turn is different from a bacterial cell and so on, all cells of all living beings have some similar molecules that It is vitally important for anyone to be alive. These molecules include DNA, ATP, and many identical or nearly identical enzymes.

It is through these similarities that it is possible to conduct comparative biochemistry studies, which shows the degree of similarity between individuals of the same species is related to the degree of kinship.

the darker peppered moth species were favored due to the fact that the industrial revolution had made all the nearby trees a darker color instead of white.

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.