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Interlude A
Unit 2:
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Interlude B
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Interlude G

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New Fossils Fill Evolutionary Gap Between Fish and Land Animals
4/6/2006 National Science Foundation (NSF)

Working in rocks more than 375 million years old far above the Arctic Circle, paleontologists have discovered a remarkable new fossil species that represents the most compelling evidence yet of an intermediate stage between fish and early limbed animals.

» Read the full article

Active Reading Questions

  1. fiogf49gjkf0d
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    To determine whether the “fishapod” described in the article is truly related to both fish and tetrapods, scientists would look for
    a) divergent features.
    b) shared derived features.
    c) any similar features.
    d) none of the above
  2. fiogf49gjkf0d
    fiogf49gjkf0d
    Scientists have given the “fishapod” the name “Tiktaalik.” This is not a scientific name because a scientific name should consist of a __________ and a __________.
    a) genus; species
    b) kingdom; phylum
    c) linnaean; hierarchy
    d) class; .order
  3. fiogf49gjkf0d
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    Explain how scientists are able to use evolutionary trees to predict the biology of organisms? Discuss how scientists use evolutionary trees to place “fishapods” between fishes and land animals.
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