Astudent believes that a beverage improves memory. two groups of students will be given a beverage before they take a test in class. which of these is the best way for the student to design the experiment?

the missing space is phylum

c should be the answer

evidence and logical support is essential for a scientist to do in order to maintain credibility. this is because no one can believe without any logic and without any evidence.hence a scientist can maintain credibility by proving himself and by answering logically so experiments prove very beneficial. logical hypothesis give conclusion which is acceptable. therefore, there are two main factors to maintain credibility by a scientist is evidence and logical support.