Which materials undergo radioactive decay?

Isotope                  Z  Comments

Thorium-232  90basis of thorium fuel cycle

Uranium-235         92fissile, main nuclear fuel

Uranium-238  92    Main Uranium isotope

Plutonium-23894used in radioisotope thermoelectric generators (RTGs) and radioisotope heater units as an energy source for spacecraft

Explanation:

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.