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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Primitive characteristicMore 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 _____________________