What are some examples of internal structures that allow organisms to surrvive in their enviorment

Plants and animals have many structures that help them survive. Some structures are internal, like the lungs, brain, or heart.

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.

d we did this already