. It is known in a pharmacological experiment that rats fed with a particular diet over a certain period gain an weight gain of 43 gms with variance 7 gms2 . Test the hypothesis that the new diet is an improvement assuming normality?

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.