"To research the subject" means to gather information and investigate a particular topic or subject in order to gain knowledge or understanding about it. Full definition
Although more research is needed due to the small number of research subjects in these studies, why wait to begin these practices? (mindbodygreen.com)
To test their theory, they made use of medical students as research subjects who are usually subjected to stress when performing important medical school tests. (ahealthblog.com)
Therefore, there are no limitations in research subjects for us. (essaywriter.org)