Final answer:
The microorganism that is part of our normal flora of the intestinal tract and is commonly used for research is E. coli (Escherichia coli).
Step-by-step explanation:
The microorganism that is part of our normal flora of the intestinal tract and is commonly used for research is E. coli (Escherichia coli).
E. coli is a gram-negative rod bacterium that is a normal resident of our digestive tracts. While most strains of E. coli are helpful commensal bacteria, some can be pathogenic and cause diarrheal diseases. However, E. coli is frequently studied by biologists due to its presence in the human gut and its potential for disease outbreaks. It is also used in various research studies.