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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.
  • Video
    Flu Attack! How A Virus Invades Your Body

    Flu Attack! How A Virus Invades Your Body

    by CK-12 //basic

    This is a video describing how a viral infection works. You can see that the virus does not reproduce on its own but instead "tricks" the host cell into making millions of copies of the virus.

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