AND, ANIMAL, AQUATIC, ARE, BLUE, BRANCH, CILIATE, CILIOPHORA, DARK, DARKFIELD, FIELD, FOR, HETEROTRICHEA, LIGHT, LM, MACRONUCLEI, MACRONUCLEUS, MICROBE, MICROBIOLOGY, MICROGRAPH, MICROORGANISM, MICROSCOPIC, MICROSCOPY, ONE-CELLED, ORGANISM, PARAMECIA, PARAMECIUM, PROTIST, PROTISTA, PROTOZOA, PROTOZOAN, SCALE, SINGLE-CELLED, SPHERES, SPIROSTOMIDAE, SPIROSTOMUM, STENTOR, TOM, UNICELLULAR, WITH,