Lightest Element, Makes Up Water With Oxygen

This page is the CodyCross answer for the clue below from Fauna and Flora, Group 164, Puzzle 5 (Pyramid of Biomass).

Question is: Lightest Element, Makes Up Water With Oxygen

and the answer is: HYDROGEN

Word Meaning:

HYDROGEN — (uncountable) The lightest chemical element (symbol H), with an atomic number of 1 and atomic weight of 1.008.

Definitions from Wiktionary.

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Lightest Element, Makes Up Water With Oxygen - Fauna and Flora CodyCross Answers | CodyCross Solutions