The answer is water. it is found in our bodies (sorry the professor said its technically closest to oxygen because oxygen is most of our body)
carbon, the fundamental component for all the macromolecules.
The most important acid deoxyribonucleic acid, or DNA, which carries the genetic code of any organism it, and the way that it transmits the individual characters in the life without this acid, or genetic code world would not exist :)
I hope you understand what I mean :)
To predict the Ph values of the solutions I thought about what I knew about each solution. Battery acid and stomach acid have the words acid in them, so I knew they would be on the acidic side of the scale. yeah