A scientist wants to prove that certain chemicals in cosmetics are likely to cause harm to developing fetuses, when used by a pregnant mother. What is the most likely limitation she will face in her scientific design?
limitations due to the time required to complete the experiment
limitations due to the system being too large to investigate thoroughly
limitations due to high expenses for equipment and supplies
limitations due to ethical concerns about experimental subjects
The answer is limitations due to ethical concerns about experimental subjects. Because the certain chemicals still need to be proved whether it is harmful. So they can not ensure the safety of the fetuses of this pregnant mother.
