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

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