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Levels are CK-12's student achievement levels.
Basic Students matched to this level have a partial mastery of prerequisite knowledge and skills fundamental for proficient work.
At Grade (Proficient) Students matched to this level have demonstrated competency over challenging subject matter, including subject matter knowledge, application of such knowledge to real-world situations, and analytical skills appropriate to subject matter.
Advanced Students matched to this level are ready for material that requires superior performance and mastery.
  • Read
    Birds

    Birds

    by CK-12 //at grade

    Discusses features of birds and their adaptions for flight.

  • Video
    Bird Evolution and Adaptations

    Bird Evolution and Adaptations

    by Charles Yu //at grade

    Beginning with Archaeopteryx, this video looks at the emergence and adaptations of birds. Feathers from modified reptilian scales and hollow bones allowed flight, and this footage also looks at feather pigments. Other bird characteristics are also observed, including eggs, nests, offspring precocity, and migration. Courtesy of Discovery Channel

  • Video
    Birds Vertebrates

    Birds Vertebrates

    by CK-12 //at grade

    This video discusses the various adaptations that have evolved in birds to support their movement into air. Emphasizes the circulatory system, reproduction, and other physical structures that make them able to thrive in air.

  • Downloadable Quiz
    Birds Quiz - MS LS

    Birds Quiz - MS LS

    by CK-12 //at grade

    Reviews features of birds and their adaptions for flight.

  • Practice
    Birds Practice

    Birds Practice

    by CK-12 //at grade

    Practice Birds questions

  • Post Read
    Birds

    Birds

    by CK-12 //at grade

    Summarize the main idea of a reading, create visual aids, and come up with new questions using a Four Square Concept Matrix.

  • Real World Application
    Making A Dinosaur

    Making A Dinosaur

    by CK-12 //at grade

    Find out how birds are dinosaurs and how scientists hope to manipulate gene expression to breed dinosaurs.

  • Real World Application
    Bird Brains

    Bird Brains

    by CK-12 //at grade

    Find out about research showing bird behavior may be far more sophisticated than previously believed.

  • Link
    Emperor Penguin

    Emperor Penguin

    by CK-12 //at grade

    The most famous penguin of them all, the emperor penguin, is described in-depth at this informative webpage.

  • Flashcards
    Birds

    Birds

    by Kyle Bardman //at grade

    These flashcards will help you better understand Life Science for middle school.

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