he most important kind of biological hazards to consider are microorganisms. A microorganism is a tiny, usually single-celled organism that can be seen only with a microscope. A microorganism that can cause disease is called a pathogen.
he most important kind of biological hazards to consider are microorganisms. Amicroorganismis a tiny, usually single-celled organism that can be seen only with a microscope. A microorganism that can cause disease is called a pathogen.