Prion - A causative agent of infectious disease that is composed primarily of protein.⏎
Rheumatic Fever - An inflammatory disease that may be caused by an untreated or improperly treated case of strep throat.⏎
Parasitism - A close relationship between two organisms in which one organism, the parasite, benefits at the expense of the host organism.⏎
Natural Selection - The process by which certain heritable traits that contribute to the survival and reproductive success of an organism become more widespread within a population over successive generations.⏎
Nanometer - A unit of length equal to one one-billionth (1 x 10-9) of a meter.⏎