Answer :
Answer:
History.
Explanation:
According to research, data that is used for this consisted of age, sex, years of experience and adequacy of training and support.
Scientific relations also are designed to find evidence that certain phenomena exist, and then to figure out the causal mechanisms behind these phenomena. Unfortunately, some things are almost impossible to test directly, and those causal mechanisms have to be inferred.
Answer:
History
Explanation:
History is considered as an alternative explanation for research findings when it is unclear whether a change in the treatment group is caused by the treatment or by a historical event that affects everyone or almost everyone in the group.