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Life Structure and Function

Life Structure and Function. A 1.4 Classification. Classification. More than 2,000 years ago, a Greek named Aristotle observed living things. He decided that any organism could be classified as either a plant or an animal.

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Life Structure and Function

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  1. Life Structure and Function A 1.4 Classification

  2. Classification • More than 2,000 years ago, a Greek named Aristotle observed living things. • He decided that any organism could be classified as either a plant or an animal. • Animal categories included hair or no hair, four legs or few legs, and blood or no blood. • Carolus Linnaeus developed a new system of grouping organisms.

  3. Classification • His classification system was based on looking for organisms with similar structures. • Phylogeny (fi LAH juh nee) is the evolutionary history of an organism, or how it has changed over time. • A kingdom is the first and largest category.

  4. Classification • Organisms are placed into kingdoms based on various characteristics. • The two-word naming system that Linnaeus used to name the various species is called binomial nomenclature (bi NOH mee ul . NOH mun klay chur). • A genus is a group of similar species.

  5. Classification • Two-word scientific names are used for four reasons. • First, they help avoid mistakes. • Second, organisms with similar evolutionary histories are classified together.

  6. Classification • Third, scientific names give descriptive information about the species. • Fourth, scientific names allow information about organisms to be organized easily and efficiently.

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