Cell devision has three main purposes; repairing the organism, reproduction and growth. Repairing the organism is important because it will allow the organism to survive longer. Reproduction is important because it allows the species of organism to live and survive longer. Growth is important because it allows the organism to grow larger and stronger.
Its A i just took the quick check
Gas exchangeis the delivery of oxygen, so im guessing it takes place in the bloodstream
A. Troposphere
Is the closest around plane flying level
