Differences In Animal Phyla

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Miscellaneous

 

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Darryl A

 

Date added:

March 3, 2015

 

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University

 

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A

 

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3 / 837

 

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The ectoderm is the outermost layers which forms the body's covering and the central nervous system. The endoderm is the innermost germ layer. It forms the digestive tube and gives rise to most organs. The third layer, the mesoderm, exists between the endoderm and ectoderm. It forms the muscles and most other organs towards the upper layer of the animal...
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Diploblastic animals, or animals with only two germ layers, lack mesoderm. There are only two diploblastic phyla: Porifera, the sponges, and Cnidaria, the "bag animals." All other animals are triploblastic. In fact, sponges are such simple animals that they lack even true tissue. They are in the parazoan category (parazoans lack true tissue)...
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