Carl Woese (1928–2012)
1758 Systema Naturae (10th edition) by Carl Linnaeus classifies known life into two kingdoms: animals and plants.
1937 French biologist Edouard Chatton divides life into prokaryotes (bacteria) and eukaryotes (organisms with complex cells).
1966 German biologist Willi Hennig establishes a system of classification based on clades—groups of organisms based on common ancestry.
1969 American ecologist Robert Whittaker divides life into five kingdoms: bacteria, protists, fungi, plants, and animals.
2017 A consensus among biologists accepts a seven-kingdom classification of life.
Before biologists ...