-causes a severe form of gastroenteritis called giardiasis
-discovered by Leeuwenhoek
-can get if you drink water without boiling it first in the wild
-has both live trophozoites and protective cysts
-string test
-teardrop shape with two eyes (nuclei)
A. Giardia lamblia
B. Entamoeba histolytica
C. Cryptosporidium parvum
D. Trichomonas vaginalis