Researchers are interested in testing whether exercising before taking an exam improves scores compared to not exercising before taking an exam. What kind of a research study design is this

Randomized control trial

Explanation:

In simple words, A randomised controlled trial (RCT) is a form of academic study or intervention research that tries to eliminate some forms of prejudice when assessing the efficacy of novel therapies by arbitrarily assigning people to two or more subgroups administering them differentially, and then evaluating their responses.

Thus, from the above we can conclude that the correct answer is randomized control trial.

d - failures.

the only attempted british colony in north america before 1600 was roanoke, virginia, which was a total failure. england claimed several areas, including newfoundland, but made no sustainable attempts to colonize them before 1600.

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when you sing louad enough the vibration of you voice is able to shatter glass so yes vibration is your answer

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