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OpenStudy (kmmcfarland27):
Which of the following properties is unique to echinoderms within higher invertebrates? radial symmetry bilateral symmetry segmentation exoskeleton made of chitin
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OpenStudy (lopez_1340):
Radial symmetry. It does not have bilateral symmetry, many other phyla are segmented (for example, earthworms), and arthropods have a chitinous exoskeleton.
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