1. Chapter 18
Classification

2. Section 18-3: Two Modern Systems of Classification
The preferred classification system for modern times is the six kingdom version.
The six kingdoms are:
Archaebacteria
Eubacteria
Protista
Fungi
Plantae
Animalia

3. Section 18-3: Two Modern Systems of Classification
Archaebacteria are unicellular prokaryotes which undergo chemosynthesis to meet their energy requirements and they live in extreme temperature underwater hot springs.

4. Section 18-3: Two Modern Systems of Classification
Eubacteria are “true” bacteria, they are the most widespread kingdom of organisms.
They live in almost all conditions and meet their energy requirements in many ways.

5. Section 18-3: Two Modern Systems of Classification
Protists are unicellular eukaryotes such as amoeba and euglena.
They live in aquatic environments and meet their energy requirements by photosynthesis or eating other protists and bacteria.

6. Section 18-3: Two Modern Systems of Classification
Fungi are heterotrophic uni- or multicellular organisms which live in many different environments and meet their energy requirements by breaking down dead organisms.

7. Section 18-3: Two Modern Systems of Classification
Plants are organisms that live in regions of relative temperature stability and they meet their energy requirements by photosynthesis or by being parasites to other plants.

8. Section 18-3: Two Modern Systems of Classification
Animals are eukaryotic, multicellular heterotrophs that must eat or absorb nutrients in the form of other organisms.

9. Section 18-3: Two Modern Systems of Classification
The other modern classification system is called the three domain system.
A domain is a broad group of organisms that have many similar characteristics.
The three domains are:
Domain Archae
Domain Bacteria
Domain Eukarya

10. Section 18-3: Two Modern Systems of Classification
Domain Archae is made up of archaebacteria.
Domain Bacteria is made up of Eubacteria.
Domain Eukarya is made up of all eukaryotic organisms. (Protists, Plants, Animals and Fungi)