Just like earth, the human body has an inner ecosystem that is located inside of the digestive tract. This living world teems with a variety of micro-flora that work day and night to keep the body healthy and in homeostasis.
The inner ecosystem stretches from mouth to rectum and is approximately 30 feet long. Neatly packed in there are millions of micro-flora organisms, both good (probiotics) and bad (pathogens) that intermingle; living in a delicate balance of harmony with one another.