The dense structure which contains proteins and RNA, found inside the nucleus,* A (Endoplasmic Reticulum)
B (Nucleolus)
C (Nucleus)
D (Ribosome)

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.

geologic time scale (for gradpoint) =)