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Autotrophs produce their food from inorganic molecules and generate most of the energy that supports life.

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.
  • Real World Application
    Swimming In Air

    Swimming In Air

    by CK-12 //advanced

    Discover the tiny photosynthetic powerhouses of aquatic environments and how they make the waters of earth habitable.

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