Apopulation of rabbits inhabits an island that has an active volcano. the volcano erupted and covered the island destroying most of the food resources available for animals living in the area. as the island recovers, the soil no longer allows for these food resources to grow. how will this most likely affect the rabbit population on the island?

The population of rabbits on the volcanic island in big portion will dye out, some as a direct consequence from the volcanic eruption, and some because of the lack of food resources. Because the food will be much more scarce, the rabbits will become much smaller, thus needing less food, and also the reproduction process will be much slower and delayed, and as the island recovers from the eruption, the small remaining population of rabbits will start adapting on the new food sources. Once the rabbits are adapted to the new food resources their population will start rising again.

maritime tropical may be your answer.

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.