When the linnaean system of classification was first develop in the early 1700s, it had 3 kingdoms by the mid-1900s , it had five kingdoms . which of the following best explains why the number of kingdoms increased

New kingdoms were needed that reflected our growing knowledge of the differences between living organisms.

The classification system requires criteria to differ the organism. As the technology and research advance, we can observe more characteristic of many organisms and found more differences between them.