Barnacles live in salt water attached to sturdy objects such as rocks. All the appropriate rock surfaces in a bay are already covered with barnacles. This lack of surfaces to attach to is an example of , which is a(n) factor, acting as a(n) factor that could stop the barnacle population from growing. A. space
B. water
C. climate
D. abiotic
E. biotic
F. limiting

google my dude. if it doesn't show up ask me.

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.

atp is used for energy.