Final answer:
Carl Woese revolutionized systematics in the 1970s by reorganizing the classification of life on Earth from a 5 Kingdom system to one with 3 Domains (Bacteria, Archaea, Eukarya). He used genetic relationships to construct his tree of life.
Step-by-step explanation:
The person who revolutionized systematics in the 1970s and reorganized all life on Earth from a 5 Kingdom system of classification to one with 3 Domains (Bacteria, Archaea, Eukarya) was Carl Woese.
He was an American microbiologist who proposed the domain as a new taxonomic level and Archaea as a new domain. Woese used genetic relationships rather than similarities based on morphology to construct his tree of life.