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Question

Why are cnidarians not triploblastic?


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Solution

Cnidarians not triploblastic:

  1. The term "triploblastic" describes the embryo's three germ layers, from which all of the organs and tissues are derived.
  2. Triploblastic organisms have three germ layers (a mesoderm as well ectoderm and endoderm).
  3. The mesoderm allows them to develop true organs.
  4. The phylum Cnidaria is the likely sister group of the triploblastic Bilateria.
  5. Because cnidarians lack mesoderm, they are diploblastic.
  6. Between the ectoderm and endoderm, there is an undifferentiated mesoglea.

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