Most people can survive only a few days without what?
carbon dioxide oxygen h2o H20 NaCl CO2 soda urea
A B C D E F G H
Water is everywhere H20.
Most people can survive only a few days without H20.
Most people can survive only a few days without what? (A) carbon dioxide (B) oxygen (C) h2o (D) H20 (E) NaCl (F) CO2 (G) soda (H) urea