Answer:
ADVANTAGES:
Bacteria are involved in production of many food products such as yogurt, cheese, pickles, etc.
Bacteria break down waste material so that our environment is not permanently cluttered with garbage, dead bodies, etc.
Bacteria are responsible for the production of important essential compounds that are necessary for life such as vitamin K production by E. coli in the gut
DISADVANTAGES:
Some bacteria cause infections or produce toxic substances that are a threat to life and/or health.
Bacteria cause spoiling of food so that it does not keep as long as we may desire.
Some bacteria may cause infections of plants, threatening our food supply or ornamental plant.