Cell breathing also known as cellular respiration. Your muscles turn chemicals into energy and produce carbon dioxide as a waste product.
For the third year in a row, Phoenix's average single-family residential water bill will remain at $37.75 per month, and the average single-family residential sewer bill will remain at $20.71 per month, both among the lowest in the nation.
The average bill in my area for a family of 4 in a 3 bedroom, 2 bath house with pressurized irrigation for the yards is probably about $30-40. No idea for 1 person in a 1 bedroom, though. Part of the bill is taxes, etc, and doesn't scale down, so I'd say maybe $15-20.