1. Classification of Life

2. Why do we classify things?
Classification- putting things into groups based on characteristics the things share
Helps scientists to:
Define characteristics for a species
Know when characteristics of a species evolved
Understand the relationships between different species

3. Taxonomy- the science of describing, classifying, and naming organisms
How would you classify these two organisms?

4. Taxonomy Carl Linnaeus- father of taxonomy, lived in the 1700s
Taxa (Taxon, singular)- the main categories of the Linnaean system of classification
Binomial Nomenclature- 2 name system of classification that includes the genus and species name; usually in Latin and written using italics
Ex: Human- Homo sapiens
Ex: Dog- Canis familiaris

5. Levels of the Linnaean System
Domain
Kingdom
Phylum
Class
Order
Family
Genus
Species
Study Tool: Did King Phillip Cry Out “For Goodness Sakes!”?

6. Domains- not part of original Linnaean system
3 Domains- Archaea, Bacteria, Eukarya
Archaea and Bacteria consist of prokaryotes- single celled organisms without a nucleus
Eukarya consist of eukaryotic cells (have a nucleus) and could be unicellular or multicellular

7. Domain Archaea
Archaea- made up of prokaryotes that live in extreme environments (very hot, very cold, high pressure, very acidic, etc.)

8. Domain Bacteria Bacteria- all bacteria that exist are in this domain
Bacteria are found everywhere and some are harmful but some are helpful too.

9. Domain Eukarya
Eukarya- contains eukaryotes- organisms that have membrane-bound organelles and a nucleus
Domain Eukarya consists of kingdoms Protista, Plantae, Fungi and Animalia

10. Kingdoms of Eukarya
Protista- are mostly single-celled, Ex: paramecium, amoeba, algae
Fungi- some are unicellular and some are multicellular, Ex: mushrooms, molds, yeast
Plantae- are multicellular with cell walls and make food using photosynthesis, Ex: trees, flowers
Animalia- are complex, multicellular organisms that do not have cell walls, are able to move and have sense organs, Ex: mammals, birds, worms, sea sponges