The kind of research method Dru is studying is a laboratory experiment.
Research refers to deep investigations of the data and information available to provide credentials with facts and figures to provide results that will utilize for the new research.
An experimental work that was carried out in a laboratory setting is and can be measured accurately due to the strictly regulated environment is called as a laboratory experiment. It offers affordable ways to measure processes and assess the theoretical limits of validity.
As in this case, it is mentioned that the research is allowing a scientist to determine cause and effect relationships, so laboratory experiments will be appropriate.
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