A forest fire sweeps through a grassland community. Most vegetation is burned in the fire, and the animals that live in the grassland are either driven out or killed in the fire. What will happen to the land affected by the fire?
It will undergo primary succession.
It will undergo secondary succession.
© It will remain dormant with no new vegetation growth.
New grass will grow, but animals will never be able to live in the area.

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.

frogs. the lower the ph the higher the acid content. frogs have the highest tolerance in this scenario.

the answer is lactic acid from anaerobic respiration. the acid in lactic acid is what creates sore and burning muscles. if you think about how acid burns that will give you a clue for questions like this.