1. Chapter 18-3: Kingdoms & Domains Essential questions: What are 6 Kingdoms of life as currently defined? What are 6 Kingdoms of life as currently defined? What is the 3 domain system of classification? What is the 3 domain system of classification?

2. The tree of life evolves The tree of life evolves –Originally 2 kingdoms – plants & animals –Then protists & bacteria put into kingdom Protista

3. –Then, mushrooms & fungi put into kingdom Fungi –Then, bacteria (lacks nucleus) put into kingdom Monera –1990 ’ s: Monera broken into 2 groups: Eubacteria & Archeabacteria –6 Kingdoms currently

4. The 3 Domain system The 3 Domain system –Based on molecular evidence of how long organisms have been evolving independently Domain Bacteria – unicellular, prokaryotic Domain Bacteria – unicellular, prokaryotic Domain Archaea Domain Archaea –also unicellular & prokaryotic –Live in extreme enviroments – volcanic hot springs, etc. –Many will die in presence of oxygen

5. Domain Eukarya – all organisms with nucleus Domain Eukarya – all organisms with nucleus –Protista – problematic b/c so much variety –Fungi – heterotrophs, feed on decaying plants/animals –Plantae – multicellular, autotrophs –Animalia – multicellular, heterotrophs

6. Kingdoms Eubacteria Archaebacteria Protista Plantae Fungi Animalia DOMAIN EUKARYA DOMAIN ARCHAEA DOMAIN BACTERIA Cladogram of Six Kingdoms and Three Domains Go to Section: Domain Bacteria Domain Archaea Domain Eukarya