KEY CONCEPT The current tree of life has three domains.

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KEY CONCEPT The current tree of life has three domains.

Classification is always a work in progress. New discoveries can lead to changes in classification. Until 1866: only two kingdoms, Animalia and Plantae Animalia Plantae

Plantae Animalia 1866: all single-celled organisms moved to kingdom Protista Protista

Animalia Protista Plantae 1938: prokaryotes moved to kingdom Monera Monera

Protista Plantae Animalia Fungi 1959: fungi moved to own kingdom Monera

Animalia Protista Fungi Plantae Archea Bacteria 1977: kingdom Monera split into kingdoms Bacteria and Archaea

The three domains in the tree of life are Bacteria, Archaea, and Eukarya. Domains are above the kingdom level. -shows prokaryotic diversity

Domain Bacteria includes prokaryotes in the kingdom Bacteria. one of largest groups on Earth classified by shape, need for oxygen, and diseases caused

Domain Archaea includes prokaryotes in the kingdom Archaea. cell walls chemically different from bacteria known for living in extreme environments

Domain Eukarya includes all eukaryotes. kingdom Protista

kingdom Protista kingdom Plantae

. kingdom Protista kingdom Plantae kingdom Fungi

. kingdom Protista kingdom Plantae kingdom Fungi kingdom Animalia

Bacteria and archaea can be difficult to classify. transfer genes among themselves outside of reproduction blurs the line between “species” bridge to transfer DNA

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