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Evolution of Simple Cells loading

Life was prokaryotic for a long time in the beginning, cyanobacteria were important for photosynthesis.

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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.
  • Real World Application
    Oceans 4.4 Ga

    Oceans 4.4 Ga

    by David Carmichael //basic

    A zircon grain is the oldest Earth material we have. It's formation temperature indicates the presence of water.

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