120X, ANIMAL, ANSER, AQUATIC, AT, CILIATE, CILIOPHORA, DARK, DARK-FIELD, DARKFIELD, DILEPTUS, EVARTS, FIELD, JAMES, LIGHT, LM, MAGNIFICATION, MICROBE, MICROBIOLOGY, MICROGRAPH, MICROORGANISM, MICROSCOPIC, MICROSCOPY, ONE-CELLED, ORGANISM, PROTIST, PROTISTA, PROTOZOA, PROTOZOAN, SINGLE-CELLED, UNICELLULAR,