Bacteria and Their Effects Bacteria can help and harm humans in the world today.The agricultural industry depends on the existence of bacteria that can transform the nitrogen gas from the atmosphere into ammonia in the soil that plants can use in a process called nitrogen fixation.Bacteria are good for recycling because they feed on dying material and convert it back into basic substances.Without decomposition the food chain would cease.Bacteria also helps in the breakdown on rocks which influences the movement of key elements,such as,sulfur,iron,phosphorus,and carbon,around the world.Bacteria are the main digesters of cellulose within cows and other animals.Bacteria are used i