Question: a 1 pts D Question 53 People progress through three stages of sleep. O TRUE O FALSE D Question 54 1 pts Ivan Pavlov's research

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1 pts D Question 53 People progress through three stages of sleep. O TRUE O FALSE D Question 54 1 pts Ivan Pavlov's research was about: O Animal development O The basic of classical conditioning O How to develop proper warning lights at railroad crossings. The essentials of understanding psychology. D Question 55

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