Is the phenol red indicator used to detect the amount of carbon dioxide or oxygen? Explain.

As the instructor, you supply the carbon source by blowing bubbles in phenol red. The carbon dioxide in your breath will dissolve in water to form carbonic acid, which lowers the pH of the solution. Phenol red turns yellow in a pH lower than 7, revealing in this case the presence of a carbon source.

Explanation:

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2%? i tried finding the exact sorry if it's not 100% correct ; -;

answer; the tunica intima also called tunica interna, consists of elastic fibers,connective tissue and smooth muscle cells;