Monerans are single-celled organisms that exist anywhere life can be found and can survive in extreme temperatures and pressures. They lack nuclei but some have flagella for movement. Bacteria are a type of moneran that feed on dead or decaying matter and living things, and are classified by shape. Blue-green bacteria contain chlorophyll and can produce their own food through photosynthesis. Monerans reproduce through binary fission under ideal conditions every 20 minutes. Viruses are tiny fragments of genetic material wrapped in a protein capsule that reproduce by taking over host cells and forcing them to produce more viruses until the host cell bursts. Communicable diseases spread via direct or indirect contact when bacteria or viruses enter the body and cause
