how doescoevolution of some plants and their pollinators affected the structure and behavior of each?

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.

not sure if this is what you'r looking for eubacteria and archaebacteria

it is called the mitotic spindle