Why do some scientists think that the Kingdom Monera should be split into two kingdoms?
By consensus, it has already been split into two kingdoms. Some scientists believed (and many more now believe) that, by classifying the creatures of “Monera” into 2 separate kingdoms, confusion is avoided. This is not to imply that the old way was chaotic. However, there was sufficient evidence to suggest that this move would be helpful, and it has relieved some confusion in the classification of these creatures. There are too many differences in these creatures to continue to think of them as all belonging to one kingdom. For more specific insights behind this reasoning, try the links supplied.