Question

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?

Answer 1

lipstick is made of chemical which could be harmful to pregnancy

Answer 2

Any scientific research and invention demands a proper scientific demonstration.

But in some cases the demonstration is practically not possible,as it can be harmful for the participating volunteers in that experiment.

According to the circumstances mentioned in the question,the scientific presentation will lack the participation of a human volunteer because this participation will harm the volunteer's reproduction system.