Rotifers live in freshwater environments and moist soil. Found in lakes, rivers, mosses, rain gutters, and sewage tanks. Most species are 200-500 micrometers long
Microbiology emerged from Pasteur and Koch's bacterial research in late 1800s. Bacteria are prokaryotic single-celled organisms without membrane-bound nucleus. Woese's 1977 discovery divided bacteria into eubacteria, archaea, and eukarya. Bacteria range in width from 0.5 to 5 micrometres and can be shaped like spheres. Archaea lack peptidoglycan in cell walls and can survive extreme environments
Bacteria are single-celled prokaryotes without nucleus or membrane-bound organelles. They are found everywhere on Earth, including human body. Bacteria are estimated to be 5 nonillion years old. They measure 1-1.5 µm in length and exist in communities of millions
Rotifers are microscopic organisms found in freshwater environments. They range in size from 200 to 500 micrometers long. Have a crown of cilia around their mouth for feeding. Use their foot and toe for attachment and movement
Diatoms are microscopic, single-celled algae with silica-based cell walls. They belong to the phylum Bacillariophyta with approximately 10,000 known species. Diatoms are eukaryotic organisms with nuclei containing genetic information