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Cnidarians loading

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.
  • Read
    Cnidarians

    Cnidarians

    by CK-12 //at grade
    Discusses characteristics of cnidarians like jellyfish and corals.
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  • Read
    Cnidarians - Advanced

    Cnidarians - Advanced

    by CK-12 //
    Examines characteristics and methods of classification of cnidarians.
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  • PLIX
    Man O' War

    Man O' War

    by CK-12 //at grade
    Cnidarians Interactive
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  • Video
    Amazing Jellies

    Amazing Jellies

    by CK-12 //at grade
    Jellies are otherworldly creatures that glow in the dark, without brains or bones, some more than 100 feet long. Learn more about jellies by watching this video.
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  • Practice
    Cnidarians Practice
    Estimated4 minsto complete

    Cnidarians Practice

    by CK-12 //at grade
     
     
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  • Downloadable Quiz
    Cnidarians Quiz

    Cnidarians Quiz

    by CK-12 //at grade
    Characteristics of Cnidarians
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  • Critical Thinking
    Cnidarians Discussion Questions

    Cnidarians Discussion Questions

    by CK-12 //at grade
    A list of student-submitted discussion questions for Cnidarians.
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  • Real World Application
    How Do You Control For The World?

    How Do You Control For The World?

    by CK-12 //at grade
    Presents the student with the challenge of designing an experiment to investigate a global phenomenon. Provides information on different and conflicting results from ocean acidification based on organismal response and latitude.
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    This indicates how strong in your memory this concept is
  • Real World Application
    Hiding In Plain Sight

    Hiding In Plain Sight

    by CK-12 //at grade
    Covers mid-water oceanic organisms, looking at how they have adapted their behavior and body plans to their environment. It also looks at how energy flows through ecosystems.
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  • Real World Application
    Did That Jelly Roll?

    Did That Jelly Roll?

    by CK-12 //at grade
    Find out how there is a lot more to jellyfish than most people think.
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  • Study Guide
    Invertebrates: Species Study Guide

    Invertebrates: Species Study Guide

    by CK-12 //at grade
    This study guide summarizes the ecology, body structure, and reproduction of sponges, cnidarians, flatworms, roundworms, mollusks, annelids, arthropods, insects, and echinoderms. It also includes further classification of arthropods and echinoderms.
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  • Flashcards
    Cnidarians Flashcards

    Cnidarians Flashcards

    by CK-12 //at grade
    These flashcards help you study important terms and vocabulary from Cnidarians.
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