Ascientist hypothesized the temperature at which an alligator egg is incubaed will determine whether the alligator will be a male or female. what is the dependent ?

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.

the cost of mining is extremely low compared to the money earned from mining, creating income to improve the environment.