Identify among the statements given below which one is incorrect about Phylum-Ctenophora.
I. They are acoelomate and diploblastic animals with tissue grade level of body organization
II. They exhibit bilateral symmetry
III. They show the presence of a gelatinous mesogloea
IV. They have transparent ctenophores which show bioluminescence
I, II and III
II and IV
I and III
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