List four ways in which bacteria interact with people?

Bacteria interact with humans in a variety of ways. These interactions include:

1) Pathogenic interactions: Some bacteria cause diseases humans, such as pneumonia, tuberculosis, cholera, and food poisoning.

2) Commensal interactions: Other bacteria live on or in humans without causing any harm. These bacteria may be involved in digestion, nutrient synthesis, and protection from harmful pathogens.

3) Mutualistic interactions: Still other bacteria provide benefits to humans. For instance, some bacteria help humans digest food, produce antibiotics, and control pests.

4) Environmental interactions: Bacteria play important roles in the environment. They help decompose organic matter, recycle nutrients, and fix nitrogen from the atmosphere.