Answer: Many species of bacteria live in your mouth and throat. These bacteria come from several different groups within domain Bacteria. You can avoid most bacterial infections by washing your hands frequently and not sharing food or eating utensils.
Step-by-step explanation:
Bacteria in general always try to live in a moist and damp area as it is their natural habitat. They can spontaneously generate in swampy areas (External bacteria which are harmful or not generally found in animals) and they certainly use some sort of energy to thrive.
Hope this helps.