Afallacy is a
a. type of medical breakthrough that is commonly accepted after fda testing
b. false or mistaken idea often based on illogical or invalid reasoning and facts
c. pill that does not contain any medicine, used to conduct double-blind studies
d. medical professional who has been trained to investigate all types of medical fraud

The correct answer is B. false or mistaken idea often based on illogical or invalid reasoning and facts. This includes things like generalizing when making claims, or things like the ad hominem fallacy where you try to refute one's argument by attacking the person and no the argument. There are numerous different fallacies and avoiding them is the key to making a sound argument when trying to prove something.

Density and pressure