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Classification of Living Things. Why Classify?. Scientific Names are dependable and universally accepted !. Carolus Linnaeus – 1707-1778. Our system is based on his work. Heirarchical system – 7 levels. Seven Levels of Classification. 1. Kingdom 2. Phylum 3. Class 4. Order

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Why classify
Why Classify?

Scientific Names are dependable and universally accepted!


Carolus linnaeus 1707 1778
Carolus Linnaeus – 1707-1778

Our system is based on his work.

Heirarchical system –

7 levels.


Seven levels of classification
Seven Levels of Classification

1. Kingdom

2. Phylum

3. Class

4. Order

5. Family

6. Genus

7. Species

Most broad

Most specific


Naming organisms
Naming Organisms

Genus species

Called Binomial Nomenclature!

Examples:

Homo sapiens –

Human


What characteristics are used
What characteristics are used?

- Similar structures

- Evolutionary relationships

- “Derived characters” – new characteristics that are evolutionary innovations

Derived characteristics are used in cladograms.



Comparative anatomy
Comparative Anatomy

Turtle Human Horse Bird Bat Seal





Dichotomous keys
Dichotomous Keys

  • written set of choices that leads to the name of an organism

  • Used to indentify unknown organisms