New dietary supplements do not undergo the same rigorous approval process as new medications. you performed a redox titration to determine the percentage of a component in a dietary supplement and in a medication. when you performed repeated trials, your percentages varied widely for the supplement but were very consistent for the medication. why do you think this happened?

New medications have more strict process to receive an approval from FDA compared to new dietary supplements which, some doesn't even need FDA's approval to be released in the market. Dietary supplements include in their labels "No approved therapeutic claims" to save them from legal responsibilities. During the titration, the repeated trials for the supplement varies from the medication is maybe because of less stability preservation of the supplement which caused it to degrade.  

Yeah, the answer is definitely b.assuming that you're a high school student or middle school student, you probably don't need your parents' to pick out your clothes anymore. and i don't know how it works at other schools, but i know that at my high school, you don't get to pick the book you read for an english assignment. your teacher picks that. the decision of what after-school job i should get, i would definitely make with from my parents and other people that i trust. ultimately, the decision is up to me, but i would need advice from people who are more experienced.