Circadian rhythms follow a roughly ________-hour cycle of wakefulness and sleep.
A) twenty-four
B) twelve
C) six
D) thirty-six
Question 2
A device that monitors the electrical activity of different regions of the brain using electrodes placed on the scalp is called a(n)
A) electrocardiograph.
B) PKE meter.
C) ultrasound transponder.
D) electroencephalogra ph.
