The simplicity of prokaryotic cells prevents them from

a) growing and reproducing

b) responding to their environment

c)forming specialised tissues and organs

d) moving through their environment

Option c) forming specialised tissues and organs, is the correct answer.

Explanation:

The simplicity of prokaryotic cells prevents them from forming specialised tissues and organs. In prokaryotes, one cell perform all the functions and activities that are necessary for the survival of cell while in multicellular organisms, for every activity a special type of cells is present which perform that particular function.

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.