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Concept Map

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Animals that exhibit radial symmetry, tissues but no organs and possess stinging cells called nematocysts.

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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
    I Listen to Color

    I Listen to Color

    by CK-12 //basic

    In this video, Neil Harbisson, born without color vision, wears an incredible piece of technology, the eyeborg, which translates colors into a symphony of sounds that Neil can associate with more colors than normal human vision can see.

  • Video
    Penn Engineers Replicate the Sense of Touch

    Penn Engineers Replicate the Sense of Touch

    by CK-12 //basic

    Learn about haptics. Haptics is a field of engineering that is focused on replicating the sense of touch. Simulating the feeling of a surface could make for more immersive entertainment, more edifying educational tools, or more realistic training devices.

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