Felix is writing a research paper about how cell phone usage affects sleep. To conduct his research the website of the National Institutes of Health (NIH). The correct keywords that will help him and are relevant to his topic are:
The words and phrases that users enter into search engines as keywords help them discover the information they're looking for.
For instance, you would put something like "high-end and durable" into the search engine if you were searching to purchase a new vehicle.
That phrase is still a keyword even though it contains many words.
Learn more about keywords:
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