Ascientist 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?
a) limitations due to the time required to complete the experiment
b) limitations due to the system being too large to investigate thoroughly
c) limitations due to high expenses for equipment and supplies
d) limitations due to ethical concerns about experimental subjects

as soon as possible i am stuck

I would also say that , D: limitations due to ethical concerns about experimental subjects, is your answer.

reason: in order for her to see whether certain chemicals in the cosmetics harm the fetuses she would have to use herself as the ginnee pig and would have to constantly test herself to see if there is in fact something in the cosmetics that affect the unborn child. 

many phylogenetic trees have a single lineage at the base representing a common ancestor. a lineage that evolved early from the root and remains unbranched is called basal taxon. when two lineages stem from the same branch point, they are called sister taxa.

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