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

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