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How can biologists be sure that the appearance of photosynthetic organisms preceded that of aerobic organisms in the Earth's evolutionary history?
Dreaming
The experience of envisioned images, sounds, or other sensations during sleep, particularly during the rapid eye movement (REM) stage.
Alpha Waves
Brain rhythms detectable by EEG, typically associated with relaxed, wakeful states, and indicating a lack of arousal in most individuals.
EEGs
Short for electroencephalograms, these are tests that measure the electrical activity of the brain and are used to diagnose and monitor neurological disorders.
REM Sleep
A sleep stage characterized by rapid eye movement, increased brain activity, and vivid dreams.
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