Protozoa - A taxonomic group of single-celled microorganisms that live in almost every kind of habitat and include some pathogenic parasites of humans and other animals. ⏎
Nanometer - A unit of length equal to one one-billionth (1 x 10-9) of a meter.⏎
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.⏎
Reproduction - The process by which parent organisms create new offspring by either sexual or asexual means.⏎