It's in the Air and Water
This page is the CodyCross answer for the clue below from World of Books, Group 294, Puzzle 5 (Ernest Hemingway).
Question is: It's in the Air and Water
and the answer is: OXYGEN
Word Meaning:
OXYGEN — The chemical element (symbol O) with an atomic number of 8 and relative atomic mass of 15.9994. It is a colorless and odorless gas. Sometimes called elemental oxygen to distinguish it from molecular oxygen.
Definitions from Wiktionary.