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Katie S

Classification of Living Things - 9 views

www.windows2universe.org/...classification_intro.html

classification

shared by Katie S on 21 Jan 13 - Cached
  • Scientists have found and described approximately 1.75 million species on Earth. Plus, new species are being discovered every day. From tiny bacteria to yeasts to starfish to blue whales, life's diversity is truly impressive! With such a diversity of life on Earth, how does one go about making sense of it all?
    • Katie S
      Katie S on 22 Jan 13
       
      This website allows you to change the reading level. Choose the level that fits you and that you can understand.
  • One way to make sense of it is by classification. Scientists put similar species into groups so that those millions of species do not seem so overwhelming. People rely on their knowledge of classification to understand what different species are like.
  • The figure at the left shows the three domains of life. The distance between groups indicates how closely related they are. Groups that are close together, like plants and animals, are much more closely related than groups that are far apart, like plants and bacteria. Do you see how the two types of microbes, Archaea and Eubacteria, are about as similar to one another as they are to animals? Recent studies have found that microbes are far more diverse than anyone had suspected.
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  • Living things are divided into three groups based on their genetic similarity. The three groups are: Archaea: very ancient prokaryotic microbes. Eubacteria: More advanced prokaryotic microbes. Eukaryota: All life forms with eukaryotic cells including plants and animals These three groups are called domains
  • The Eukaryota domain is divided into several groups called kingdoms. Kingdom Protista – Organisms with just one eukaryotic cell Kingdom Fungi – Including mushrooms and other fungus Kingdom Plantae – Including trees, grass and flowers Kingdom Animalia – From snails to birds to mammals like you!
  • Within each kingdom, species are further classified into groups based on similarities. For example, the full classification of a human is: Domain Eukarya Kingdom Animalia Phylum Chordata Subphylum Vertebrata Class Mammalia Order Primates Family Hominidae Genus Homo Species sapiens
  • Katie S on 21 Jan 13
     
    Explanation of how living things are classified
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