Answer:
addresses a gap in knowledge
Explanation:
Every scientific experiment begins with an observation or a question. This question is called a scientific question. A scientific question is a question that helps the scientist or experimenter get to the root of an investigation, like a head start. One important character a scientific question is that it must be able to be tested via experimentation.
In this question, the phrase that best describes a good scientific question is that it should ADDRESS A GAP IN KNOWLEDGE. This means that it should aim at filling a void or contribute to knowledge.
