Match the causes with their effects. Cause: Convection currents cycle through magma.
Cause: Unstable isotopes inside Earth release energy.
Cause: Iron in Earth’s outer core swirls due to convection currents.
Effect: Radiogenic heat is released.
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Effect: Earth has a powerful magnetic field.
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Effect: Tectonic plates move.
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Convection currents cycle through magma-Tectonic plates move.

Unstable isotopes inside the earth release energy-Radiogenic heat is released.

Iron in Earth's outer core swirls due to convection currents-Earth has a powerful magnetic field.

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.

i believe your answer would be c.. : )