Memory Anchor:

• Super Challenge:

  Stretch:

  Challenge:

Key Questions:

1. How have organisms been classified traditionally and who by?
   • Traditionally living things have been classified into groups depending on their structure and characteristics in a system developed by Carl Linnaeus
2. What did Linnaeus classify all living things into?
   • Linnaeus classified living things into kingdom, phylum, class, order, family, genus and species.
3. How are organisms named scientifically?
   • Organisms are named scientifically first by the genus and then by the species.
4. What development lead to new models of classification and how?
   • As evidence of internal structures became more developed due to improvements in microscopes, and the understanding of biochemical processes progressed, new models of classification were proposed.
5. Who developed the 'three-domain system' and how are organisms in this system classified?
   • Due to evidence available from chemical analysis there is now a ?three- domain system? developed by Carl Woese. In this system organisms are divided into: ? archaea (primitive bacteria usually living in extreme environments) ? bacteria (true bacteria) ? eukaryota (which includes protists, fungi, plants and animals).
6. Why are evolutionary trees used by scientists and what data do they use for it?
   • Evolutionary trees are a method used by scientists to show how they believe organisms are related. They use current classification data for living organisms and fossil data for extinct organisms.