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Biologists Use Seven Levels Of Classification

Biologists Use Seven Levels Of Classification

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Biologists Use Seven Levels Of Classification

  1. 1. Classification<br />
  2. 2. Objectives<br />Explain why and how organisms are classified. <br />List the eight levels of classification. <br />Explain scientific names.<br />Describe how dichotomous keys help in identifying organisms.<br />
  3. 3. Why Classify?<br />The classification of living things makes it easier for biologist to answer many important questions such as:<br />How many known species are there?<br />What are the defining characteristics of each species?<br />What are the relationships between these species?<br />
  4. 4. History of Classification<br />Greeks<br />Aristotle<br />English<br />John Ray<br />Swedes<br />Carolus Linnaeus<br />Taxonomy: science of describing, naming, and classifying things<br />Binomial Nomenclature<br />
  5. 5. How do Scientists Classify Organisms?<br />Taxonomists use the seven-level system to classify living things based on shared characteristics.<br />On a branching diagram, several characteristics are listed along the line that points to the right. Each characteristic is shared by the organisms to the right of it. <br />
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  7. 7. Levels of Classification<br />The seven levels of classification are:<br />Kingdom<br />Phylum<br />Class<br />Order<br />Family<br />Genus<br />Species<br />
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  9. 9. Scientific Names<br />A scientific name is always the same for a specific kind of organism no matter how many common names there might be.<br />Ex: Mountain lion, puma, cougar, panther are all the Puma concolor<br />The first part of a species' name is the genus name which is always capitalized. The second part of the name is the species name.<br />
  10. 10. Dichotomous Keys<br />A dichotomous key is a tool for identifying organisms that uses a series of paired descriptive statements.<br />By working through the statements in a dichotomous key in order, a person can eventually identify an unknown organism.<br />

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