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The first cells were likely heterotrophs, who "fed" on the organic molecules, or chemoautotrophs, who used the energy in inorganic 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
    Life Before Oxygen

    Life Before Oxygen

    by CK-12 //basic
    Talks about how photosynthetic organisms transformed the Earth's atmosphere and life on Earth.
    This indicates how strong in your memory this concept is
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