Hox genes were discovered when researchers found adult fruit flies with body parts in the wrong place. what term describes the types of mutations that cause this phenomenon

The correct answer is homeosis.

Homeosis is the phenomenon that can be described as transformation of one organ into another. It is the result of, mutation in or misexpression of certain developmentally critical genes, like homeotic genes. Homeotic mutations change segment identity during development.

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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.