Think critically .Most animals do not not have a back bone . they're call Invertebrates. what are some advantages that Invertebrate animals might have over vertebrate animals ? plz help

Their exoskeleton is stronger than their skin. If they break a body part, they can grow it back after some time. They are more flexible than vertebrate.

he is very short, and he can only reach halfway up on the elevator buttons. but on a rainy day, he has his umbrella with him, and he uses it to poke the button at the top.

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.