microscopic unicellular organisms: protozoa paramecium caudatum, amoeba proteus, chlamydomonas,

algae amoeba animal bacillus background bacteria bacterial bacterium biology caudatum cell celled chaos chlamydomonas chlorella diffluens education euglena eukaryotic glass green illustration isolated magnifying micro microbe microbiology microorganism microscopic optical organism paramecium prokaryotic proteus protist protista protistm protozoa protozoan science set single spirogyra study unicellular vector viridis white zoology