The mature stage. I hope this was helpful.
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.
The mutation<span> caused by the addition of a nucleotide to an already existing gene sequence is duplication.</span>
