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In some individuals the immune system responds to non-pathogenic molecules.

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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
    Body Story - Episode 7 - Part 1 of 4 - Out of Control

    Body Story - Episode 7 - Part 1 of 4 - Out of Control

    by CK-12 //basic

    Body Story is an educational science series focused on the human body and the biological processes it undergoes during distinct life events. The series has been praised equally for its educational content, impressive visual graphics, and engaging human stories. Produced by Wall To Wall for the Discovery Channel, episodes 1-3 were released in 1998 and episodes 4-7 were released in 2001. - Youtube User: Flixwest

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