(Last edited: Saturday, 24 February 2024, 1:51 PM)
Answer:
Bacteria are single cells that can survive on their own, inside or outside the body. They are found almost everywhere on Earth and are vital to the planet's ecosystems. The human body is full of bacteria, and in fact is estimated to contain more bacterial cells than human cells. Most bacteria in the body are harmless, and some are even helpful. A relatively small number of species cause disease.