Symmetry
Bilateral Symmetry:
Only a single imaginary plane can divide the body into two equal halves. |
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Radial Symmetry:
Only number of imaginary planes can be drawn through the center, each dividing the body into equal halves. |
Direction
Tissues
Body Cavities
Exoskeleton vs. Endoskeleton
Internal Skeleton
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External Skeleton
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Cephalization
Photo used under Creative Commons from Bloody Nick