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Which img attribute provides a fallback mechanism for the browser to fall back on if the image cannot be displayed?
Sleep Lab
A sleep lab is a facility equipped for observing and recording a person's sleep patterns to diagnose sleep disorders.
Electroencephalograph (EEG)
A device used to record electrical activity of the brain through electrodes placed on the scalp.
Delta Waves
Slow brain waves predominantly observed in the deepest stages of sleep, indicating deep sleep and unconsciousness.
Stage 3 Sleep
A deep stage of sleep characterized by low frequency delta waves, essential for restorative sleep functions.
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