unicellular organism: protozoan gliding across a droplet, reflecting the simplicity and complexity of primitive life

specimen natural flagellate movement parasite habitat bacteria protozoon bacterium structure flagella water exploration cell microscope tiny living aquatic ecosystem microscopic research microorganism unicellular microbe species pathogen ecology amoeba ciliate biology science disease zoology nature protozoa environment evolution singlecell nucleus colony protozoan study protist plankton life organism biodiversity infection eukaryote ai generated