Firstly, bacteria can be harmful as well as benificial to humans. Since your question pertains only to benifiacial bacteria, the answer follows:-
Bacteria help humans by fuel, food, environmental recycling, environmental cleanup, and health and medicine.
Fuel- Gas For our Cars
Food- Yogurt, milk, cheese, etc
Environmental Recycling- Cleaning up major gas and oil spills
Health and Medicine- Antibiotics, any med. that ends in -sillen or -botics
Humans. Humans are animals.
People, humans.
Humans use silver
Most Humans Where Shirts.
none, just humans use computers
Houses and paper
The female sex (in humans).
Wolves and humans.
us humans, animals, and living things....mostly like everyone uses it!
Beavers Certain birds Humans Orangutans
dried arrangements and medical uses
The only enemy that alligators have are humans. Alligators become prey to humans as food and other uses.