This food web shows some of the relationships found in an aquatic ecosystem. Materials cycle
through the ecosystem as organisms consume one another.
What do the arrows in the food web represent?
A. the relative location of organisms in the ecosystem
B. the flow of energy from one organism in the ecosystem to another
C. the relative sizes of organisms in the ecosystem from smallest to largest
D. the increase in complexity of organisms from producer through consumer

B. the flow of energy from one organisms in the ecosystem

Explanation:

that should be the right one :)

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.

in 1859, charles darwin set out his theory of evolution by natural selection as an explanation for adaptation and speciation. he defined natural selection as the "principle by which each slight variation [of a trait], if useful, is preserved".