Answer:
The answer is B double-blind study
Explanation:
In this type of scientific study neither the experimenter nor the researcher knows the study sample, during the period that the experiment lasts, in order not to influence the results.
Answer:
A newborn's baby arent fully developed yet and as they are newborn, they need time to start ag a fresh sight.
1950 I believe possibly 1970
Answer: Uh...
Explanation: Please give more info
