Echinoderms are classified as Bilateria, but although they start out as bilateral larvae, they change into radially symmetrical adults. You might hypothesize that their genes controlling the development of radial symmetry are
A. similar to a common set of genes controlling body form in Ctenophora and Lophotrochozoa.
B. similar to genes controlling body form in Ctenophora.
C. different from those controlling development of symmetry in all other radially symmetrical animals.
D. similar to genes controlling body form in Lophotrochozoa.
E. similar to genes controlling body form in Porifera.
Answer: C
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