Biological Rhythms: the sleep-waking cycle

ARCTICCIRCLE
BIOLOGICAL
CAVE
CIRCADIAN
CIRCANNUAL
ENDOGENOUS
EXOGENOUS
EYE
HAMSTERS
HYPOTHALAMUS
INFRADIAN
LIGHT
MELATONIN
MENSTRUAL
NOISE
PINEAL
SCHOCHAT
SCHOCHAT
SCN
SIFFRE
SLEEP
SLEEPY
SUPRACHIASMATIC
TEMPERATURE
TWENTYFIVE
ULTRADIAN
ZEITGEBER

See how much you remember about biological rhythms and the sleep-waking cycle with this wordsearch. Answer the questions first then look for the missing word in the grid below.

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Answer Key for Biological Rhythms: the sleep-waking cycle

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Word X Y Direction
ARCTICCIRCLE  88e
BIOLOGICAL  143w
CAVE  1818w
CIRCADIAN  1818n
CIRCANNUAL  99e
ENDOGENOUS  198s
EXOGENOUS  1116nw
EYE  198n
HAMSTERS  1620w
HYPOTHALAMUS  1620nw
INFRADIAN  158s
LIGHT  188n
MELATONIN  1215nw
MENSTRUAL  711s
NOISE  149s
PINEAL  66e
SCHOCHAT  44e
SCHOCHAT  44e
SCN  44s
SIFFRE  38n
SLEEP  59sw
SLEEPY  38s
SUPRACHIASMATIC  1111se
TEMPERATURE  1216w
TWENTYFIVE  177w
ULTRADIAN  55e
ZEITGEBER  216n