Answer:
When CO2 is breathed into the lungs, it dissolves in the water there, diffuses across the alveolar-capillary membrane, and enters the bloodstream. As it combines with water, it forms carbonic acid, making the blood acidic. So CO2 in the bloodstream lowers the blood pH.
One advantage would be fertility
The tissues found within the vein if I must say are xylem and phloem. Glad I can help.
Answer:
..mmm.... high pressure I guess.....
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and are you sure that the outside will be freaking cold with a freaking sun above ..??..