In the domain Bacteria, there are typically considered to be multiple kingdoms. The most commonly recognized kingdom within the domain Bacteria is the Kingdom Eubacteria.
1. Kingdom Eubacteria: This kingdom consists of diverse bacteria that are commonly found in various environments. Eubacteria include many familiar bacteria such as E. coli and Streptococcus.
Therefore, the correct answer to the question "How many kingdoms are there in the domain Bacteria?" would be B. 1 (One), with the Kingdom Eubacteria being the main kingdom within the domain Bacteria.
