Why would a finch population that lives on an island have a higher rate of speciation than a finch population that lived in a large forest in north america?
a. the island finches have higher genetic drift.
b. the island finches have more spatial isolation.
c. the island finches have more behavioral isolation.
d. the island finches will mutate more frequently.

answer; i believe that the correct answer is (b) melosis; plz check first.good luck

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.