What is the main skeletal difference between salt water eels and lamprey fish besides the jaw

The main skeletal difference between water eels and lamprey is that the body of lamprey lacks bones and has a skeleton made up of cartilage. On the other hand, the skeleton of salt water eels is made up of bones.

Other differences between the two fishes include :

answer; i believe that the correct answer is ; males are hemizygous for the x chromosome;

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.