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Levels are CK12'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.
  • 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

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