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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.
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    Cells

    Cells

    by CK-12 //basic

    Provides a brief history of the evolution of cells from simple anaerobic prokaryotes to more sophisticated aerobic eukaryotes. Also provides a history of cell theory and how cells were discovered.

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