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Key Concept Builder
LESSON 2
Classifying Organisms
Key Concept What methods are used to classify living things into groups?
Directions: The system used to classify organisms has changed over time. Put each system listed below in the
order it was used, starting with the oldest system.
Aristotle’s two groups, plants and animals
Linnaeus’s two-kingdom system, plants and animals
Systematics
Whittaker’s five-kingdom system
1.
2.
3.
4.
5. What is the diagram below called?
Salamander
Salmon
Hamster
Chimpanzee
Lizard
Opposable thumbs
Fur, mammary glands
Claws or nails
Lungs
6. Which organisms shown have claws or nails?
7. Which organisms shown do not have opposable thumbs?
Classifying and Exploring Life