Classification History Based on Aristotle it was once

Classification

History • Based on Aristotle, it was once thought that there were only two kingdoms: plants and animals. • Linnaeus is known for founding the science of taxonomy. • Over 500, 000 new species have been discovered since 1978.

Vocabulary Terms Classification – the process of arranging organisms into groups based on similarities Taxonomy – the science of naming and classifying organisms Binomial nomenclature – Assigning the Latin words genus (capitalized) and species (lowercased) name as the scientific name

- Classifying Organisms Questions • Classifying Question Answer Why do scientists classify? Scientists classify because they want to organize living things into groups so they are easier to study. What system did Linnaeus use to name organisms? He used a system called binomial nomenclature. Domain, kingdom, phylum, class, order, family, genus, species What are the levels of classification?

Seven Levels of Classification Kingdom Phylum Class Order Family Genus Species

- Classifying Organisms Levels of Classification • As you move down the levels of classification, the number of organisms decreases. The organisms at lower levels share more characteristics with each other.

Classifying Animals

The Six Kingdoms

Organisms are classified by their characteristics. Today scientists look at cell structure, how an organism moves, gets food, and reproduces.

The Six Kingdoms 1. 2. 3. 4. 5. 6. Animals Plants Fungi Protists Archaebacteria Eubacteria

The Animal Kingdom Distinguishing characteristics: • Multicellular • Reproduce sexually or asexually • Highly mobile • Cannot make their own food

The Animal Kingdom The animal kingdom is divided into invertebrates and vertebrates. Organs are much more developed in the animal kingdom than the other kingdoms.