b. eubacteria
NOT:
a. protista c. plantae d. fungi
Not all bacteria are harmful because some of them are beneficial to the body that are commonly found in the stomach, mouth and esophagus. These friendly bacterial is called probiotics. Two of the most beneficial uses of bacteria is it helps in regulating the bowel movement since bacteria helps in the processing of body wastes. Another benefit of bacteria is that it improves the immune system. It is done by increasing the antibodies to fight the dangerous bacteria.