Which climate has a mean temperature below 10°c during the warmest month? ?

The correct answer is Polar climates.

The polar climate areas are featured by an absence of warm summers. Each month in a polar climate exhibit a mean temperature of fewer than 10 degrees Celcius. Even in their warmest months, they have a mean temperature of fewer than 10 degrees Celcius.

The countries coming under the polar climate regions are Alaska (United States), Yukon (Canada), Greenland (Denmark), Finland, Norway, Iceland, Sweden, and Russia.

i think its c. amphipod

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.