antibiotic
Stomach
They help kill bad baceria in your human body.
The weight of bacteria in human body is estimated to be 1 to 2 percent of the entire body mass. Bacteria is useful and can be harmful to the body.
The organisms that cause the diseases that we are looking at and human cells are both eukaryotic cells, so only certain drug can be used to rid the both of the infection without harming the human body. When we use antibiotics to kill bacteria, it is usually targeted at the cell wall. This doesn't kill human cells because their cells don't have a cell wall.
they help kill bad bacteria in your body
certain chemical reactions do kill bacteria for example when bacteria enters the body the stomach contains High concentrations of Hydrochloric acid which destroys the bacteria preventing further damage to the body.
Bacteria
Yes, the stomach do kill bacteria. But in the presence of Hydrochloric acid (HCl). This acid can be harmful to the human body also if mucous layer lining the internal layer of the stomach and the alimentary canal is destroyed resulting in peptic ulcer.
When it's outside the human.
RECTUM
Yes it is found in air soil and the human body.