plankton aquatic phytoplankton and planktonic microorganism under microscope in ocean set of micro

algae animal aquarium aquatic background biology cell chain copepod crustacean fauna fish flora food illustration isolated lab laboratory life macro marine micro microbiology microorganism microscope microscopic natural nature nucleus ocean organism phytoplankton plankton planktonic pond protozoa research science sea seabed small undersea underwater vector water wildlife zoology zooplankton