A block of iron has a volume of 60 cm3 and it's mass is 420 g then it's density is

Density (ρ) = 7 gram/cubic centimeter

Explanation:

Density is the mass of an object divided by its volume.

Density often has units of grams per cubic centimeter (g/cm3).

So, the block of iron would have a density of ( 420 g / 60 cm^3 =) 7 gram/cubic centimeter

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.

ask your friends for what they got then copy it down if you don't have any friends which is fine than google it or pay the teacher