Which one of the following statements about the phylum Echinodermata is false?

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聴the sea stars.Which one of the following statements about the phylum Echinodermata is false?
The only fault I can find in all the statements above is in C.





Echinoderms are radially symmetrical, but their symmetry is called pentaradial, not true radial.





This is because it can be symmetrical when cut through in the middle of any one of it's FIVE feet.