phytoplankton small organisms

algae animal aquarium biology cell chain chloroplast contractile desmidiacea division education experiment fauna flagellum flora food freshwater green laboratory life macro macronucleus micro microbiology microcosm microorganism microscope nature nucleus organism paramylon peat phytoplankton plankton pond protozoa protozoan research school science scientific university vacuole vectorr water wildlife zoochlorella zoology zooplankton