Which lists the correct sequence of events for evolution to occur through isolation? founding population arrives, biogeographic isolation occurs, genetic changes occur, reproductive isolation results genetic changes occur, founding population arrives, reproductive isolation results, biogeographic isolation occurs biogeographic isolation occurs, founding population arrives, genetic changes occur, reproductive isolation results founding population arrives, genetic changes occur, biogeographic isolation occurs, reproductive isolation results

The first sequence makes more sense to me.

The answer is "founding population arrives, biogeographic isolation occurs, genetic changes occur, reproductive isolation results".

When the founding population arrives, the population must adjust to its surroundings. Biogeographic isolation occurs, and the population will adjust accordingly to best live on their new habitat. Genetic changes occur, and the population will produce offspring that carry their new genetic changes. This produces reproductive isolation results through the new population.

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.