I believe the answer is Observational study
In an observational study, the data input couldn't be controlled by researchers because it's relative to the subject.
This type of study usually being conducted in researchers that involve ethical measurement or Personal opinion.
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I will ask my sister for help and help you
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I am pretty sure this would be 2.
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These 21st-century skills are more important to students now than ever before. They not only provide a framework for successful learning in the classroom, but ensure students can thrive in a world where change is constant and learning never stops. And they are also tremendously important for our nation's well being.
The second branch of government according to the constitution is the Executive Branch. I think