Some protozoans have special organelles called contractile vacuoles that continually eliminate excess water from the cell. the presence of these organelles tells you that the environment is what to the protozoan?

Liquid and with a higher osmotic pressure

Explanation:

Remember that a cell that is surrounded by an environment with a higher osmotic pressure, will produce that the cell get some water outside to make some dilution to the salt concentration that surrounds the protozoan.

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.