Element Required for Respiration
This page is the CodyCross answer for the clue below from Photography, Group 2003, Puzzle 5 (Gallery Pieces).
Question is: Element Required for Respiration
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.