A scientist categorized a rock as an extrusive igneous rock. Another scientist could accurately categorize the same rock as A. Intruesive ingeous
B. Clastic sedimentary
c. metamorphic
D. volcanic
Anwser as soon as you can

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.

a=c and then d= c because of the band so you get ac/dc and you add them together you get sound waves