A) Bilateral symmetry
B) Gill opening
C) Body scales
D) Cnidoblasts
Correct Answer: D
Solution :
Cnidoblasts are not found in vertebrates. They are found in Coelenterata. Cnidoblasts, nematoblasts or stinging cells are organs of offence and defence of coelentrates. Each cnidoblast bears a sensory bristle or cnidocil and bladder or a sac called nematocyst.
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