spirogyra sp. algae under microscopic view, chlorophyta, dark background

spirogyra sp algae microscopic view chlorophyta dark background green biology micro chloroplast microbiology cell organism protozoa unicellular water nucleus microorganism vector structure cytoplasm euglena pond science white life protista single macro protist microscope eukaryotic freshwater nature chlorella singlecelled research zoology protozoan prokaryotic protistm biotechnology viridis agriculture lab plankton natural microscopy swim cilia filamentous