The three descriptions that best characterize good research questions are:
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Not too broad - Good research questions should be specific enough to allow for focused investigation without being too generalized.
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Narrow in focus - A well-defined research question allows for in-depth exploration of a particular aspect of a topic, making the research process more manageable and precise.
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Applicable to the topic - Good research questions should be relevant to the subject matter and contribute meaningfully to the field of study.
The other options, "full of scientific vocabulary" and "about more than one subject," do not necessarily characterize good research questions. It's important for research questions to be clear and concise, which often means avoiding unnecessarily complex vocabulary, and focusing on a single subject tends to yield better results.