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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 • 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)
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 _____________________
