scientist male character working on laptop reading information and learning protozoa unicellular paramecium caudatum

protozoa unicellular scientist microbiology biology scientific protozoology bacteria character lab coat working laptop reading information learning paramecium caudatum laboratory science people vector man human person organism microorganism euglena protist amoeba virus cell bacteriophage germ protozoan bacillus paramecia disease parameciidae microbiota infectious bacterium microscopic microscopy animal cause male cartoon illustration computer