It has the ectoderm which is the body covering the

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and isolates organs. It has the ectoderm, which is the body covering, the mesoderm which is the tissue layer lining  coelom that suspends internal organs. The coelom in between and then the endoderm, the digestive tract in the  middle.  3. Segmentation allows organisms to have more control over bodily movements because the movement of food is  now independent from locomotion. The worms grow by the addition of structurally and functionally  compartmentalized segments. We can assume that this is adaptive as we can see that worms are organisms in  becoming more complex 4. Since acoelomates lack the fluid cavity they organism does not have the cushion to support a complex organ  system. Because of this the movement of the body and the movement of the food and fluids are linked. They  cannot divide their functions, and are not as complex. 5. Hypothesis: Cnidarians have tentacles armed with enidocytes that are equipped with nematocytes, an incomplete  digestive system and 2 main body stages. Deduction: If the unknown creature: Has stinging tentacles  Has only one main opening that serves as the mouth and the anus  Can live in either the polyp or medusa stage and can alternate between them through their life cycles. Then the unknown creature is most likely to be a Cnidarian. 
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  • Spring '14
  • EbenB.Goodale
  • Ashley Alderman, Ecdysozoa. Also,the roundworms, common ancestor Lophotrochozoa., unknown creature, layer lining  coelom, main body stages

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