1.
During the time of Linnaeus and the first classification of life, there were kingdoms.

2
3
5
2.
In 1969, Whittaker proposed moving the from the kingdom Plantae to a separate kingdom due to structural and metabolic differences.

Protista
Monera
Fungi
3.
Woese introduced a new method of classifying life on Earth when he introduced the , defined as a taxon higher than the kingdom.

clade
domain
Supra-kingdom