Suggested answer for Exercise 2 -- Part A
(Click the Steps to run the demonstration.)
This is a suggested answer. Your approach, as well as the number of results retrieved, may vary. New citations are added regularly to PubMed.

Part A.

In one search, find references about the relationships between circadian rhythms and either cortisol or melatonin in humans.

• Step 1: Enter circadian rhythms AND (cortisol OR melatonin) AND humans in the search box and click Search.
  
  [Note: You may instead use Filters to select Humans. The search terms may be in any order but the OR phrase must be in parentheses.]
  

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