With. It's immune system
No.
great question. some are bad but 98% (something like that) are good! Just learned that in school. hope this helps :)
Bacteria live everywhere in the air, in soil, in water, in food, and on every sort of plant and animal. They live inside our bodies and, while some bacteria are harmful to humans and other animals...
Yes they r cuz they can give a desease or a sickness/illnes