5 no body cavity to a body cavity with muscle lined organs or coelom
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5. No body cavity to a body cavity with muscle lined organs or coelom. A coelom allows for internal organs to operate independently of each other. Cardiac muscle squeezes heart independently of muscle moving food through the digestive track.

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5 no body cavity to a body cavity with muscle lined organs or coelom
5. No body cavity to a body cavity with muscle lined organs or coelom

  • A coelom allows for internal organs to operate independently of each other.

  • Cardiac muscle squeezes heart independently of muscle moving food through the digestive track.


6 no head region primitive cephalization head region with sensory organs more recently evolved
6. No head region (primitive)Cephalization- head region with sensory organs. (more recently evolved)


Let s review what are the major trends in animal evolution
Let’s review..What are the major trends in animal evolution???

Primitive characteristic More recently evolved characteristic

One tissue layer or ______________ or______________

_____________ ______ or _______ _____________and bilateral symmetry

No body cavity or _______________________

Water habitat or _______________________

_______________ _________ or “tube within tube” body

No head region or _____________________


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