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D. Areas where the Earth's mantle experiences a high amount of stress.

A. It is likely made up of the metals nickel and iron.

Explanation:

Tectonic plates are located in the uppermost area of the Earth's mantle.

The core of the Earth (innermost layer) is made up primarily of nickel and iron.

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a

Explanation: the innermost layer of earth comprises of super heated molten lava that’s mostly NICKEL AND IRON.

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.

answer; both surfaces of the membrane are nonpermeable