The organ system that obtains oxygen from the air and disposes of waster carbon dioxide back into the air is the system. What is the blank answer?

they fuse to form they have half as many chromosomes as a somatic cell of the same individual. b

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.

i believe the answer would be b. hope it : )