The bacteria break down dead plants and animals/ decompose. This creates nutrients for other living things to use.
Bacteria used in Food
Many foods like cheese, yogurt, buttermilk, and sour cream have bacteria in them. They preserve and add flavor to the food that you eat.
Antibiotics are made my bacteria, to kill bacteria. It is also used for people with diabetes because they don't receive enough insulin in their bodies. Scientist discovered how to put genes into bacteria to produce human insulin.
There are also many Harmful Bacteria
There are some bacteria that are harmful because they can causes diseases/ pathogenic.
Bacteria also damage other organisms, such as plants and animals. They can cause damage and kill the organisms.