Courtney is a participant in a laboratory sleep study. Her EEG begins showing small bursts of electrical activity known as sleep spindles and K-complexes. Courtney has entered which stage of sleep?

Stage 11 sleep

Explanation: the human body has different stages of sleep. There are 4 stages of sleep with their special characteristics. The stage 2 type is characterized by the the body being in a state of intense relaxation, no eye roll movement, brain waves shows sleep spindles intermingled with sleep structures called sleep complexes. The sleep spindles and K complexes helps keep the brain from being conscious from sleep by protect in the brain. It's also characteristed by low body temperature and slower heart beat

- "sack of constantinople, (april 1204). the diversion of the fourth crusade from the holy land to attack, capture, and pillage the byzantine city of constantinople divided and dissipated the efforts of the christians to maintain the war against the muslims. the fourth crusade was corrupted from its purpose early on."

- "the crusades were a series of religious wars undertaken by the latin church. the first crusade arose after a call to arms in 1095 sermons by pope urban ii. the first crusade unleashed a wave of impassioned, pious catholic fury, which was of constantinople, the capital of the christian-controlled byzantine empire."

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i believe the answer is:   psychological  experiment

in this experiment, wilhelm wundt became the first person that implement scientific method in analyzing the pyschological phenomenon.

due to this result, wilhelm wundt also able to make psychology to be acknowledged as a separate scientific field from biology.