Despite their relative simplicity, carry out most of the key chemical changes of , , and sulfur in the living world. The , like us humans, perform relatively small changes to their molecules.
Benefits of include:
► Bacteria are the only living things which can fix nitrogen. They are therefore essential to all other life on Earth.
► Some plants such as beans keep nitrogen fixing bacteria as in nodules on their root.
► Bacteria are the major decomposers of plants and animals, so freeing their to be re-used by other living things.
► Cows and other animals keep bacteria in their stomachs, as only bacteria can break down the tough cell walls of plants.
► People use bacteria to turn wine into vinegar and milk into cheese and yogurt.
► They are increasingly used in biotechnology to manufacture .
There is information about good and bad bacteria at Good and Bad Bacteria
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