Each Person's Inner "biological Clock": __ Rhythm
This page is the CodyCross answer for the clue below from The 90s, Group 1139, Puzzle 2 (Power Rangers).
Question is: Each Person's Inner "biological Clock": __ Rhythm
and the answer is: CIRCADIAN
Word Meaning:
CIRCADIAN — (biology) Of, relating to, or showing rhythmic behaviour with a period of approximately 24 hours; especially of a biological process.
Definitions from Wiktionary.