Fish Use Gills for This Process
This page is the CodyCross answer for the clue below from Campsite Adventures, Group 821, Puzzle 4 (Roaring Fire).
Question is: Fish Use Gills for This Process
and the answer is: BREATHING
Word Meaning:
BREATHING — verbal noun of breathe: (uncountable) The act of respiration; (countable) a single instance of this.
Definitions from Wiktionary.