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Home Q & A Board Biology-Related Homework Help Zoology and Botany (Moderator: ehd123)
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NurseMD NurseMD
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11 years ago
a. Many species possess an internal calcareous skeleton and spiny dermal projections.  
b. Larval forms show evidence of bilateral symmetry, which is mostly lost in the adult form.
c. Echinoderms have true radial symmetry as adults.
d. All possess a water vascular system, which permits movements via tube feet.
e. One of the classes in this phylum is Asteroidea—the sea stars.
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Fireman 2.Fireman 2.
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11 years ago
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