One difference between bacteria and viruses is

down below

Explanation:

1. viruses cannot survive without a host

2. viruses are smaller than bacteria

3. viruses attach themselves to another living cell and use that cells' genetic material to reproduce themselves

chordata is the answer

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.