I want to know the answer to the following question:
How does gut flora prevent growth of pathogenic bacteria?
All the background I'm provided with is that "For example, the presence of over 1,000 bacterial species in the normal human gut flora of the intestines can contribute to gut immunity, synthesise vitamins, such as folic acid, vitamin K and biotin, convert sugars to lactic acid (see Lactobacillus), as well as fermenting complex undigestible carbohydrates.". Is that enough to answer the question?
Answer: no