ANIMAL, AQUATIC, BRANCH, CILIATE, CILIOPHORA, DARK, DARK-FIELD, DARKFIELD, FIELD, FOUR, LIGHT, LM, MICROBE, MICROBIOLOGY, MICROGRAPH, MICROORGANISM, MICROSCOPIC, MICROSCOPY, ON, ONE-CELLED, ORGANISM, PARAMECIA, PARAMECIUM, PROTIST, PROTISTA, PROTOZOA, PROTOZOAN, SINGLE-CELLED, SPECIMENS, TOM, UNICELLULAR,