Examlex
_____ best explains those high-frequency sounds (above 1,000 times per second) .
Biological Clock
An internal mechanism that regulates physiological and behavioral rhythms in organisms in a roughly 24-hour cycle.
Retina
The light-sensitive layer at the back of the eye that contains cells which convert light into electrical signals sent to the brain.
Beta Waves
A pattern of brain waves that are associated with active, alert thought and a focused state of mind.
Delta Waves
Slow and high amplitude brainwaves that are typically associated with deep sleep and aid in the body's healing process and rejuvenation.
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