Cnidarians and ctenophores share which of the following characteristics?
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a
Alternation of polyp and medusa stages
b
Tissue level of organisation
c
Colloblasts for anchorage
d
Comb plates for locomotion
answer is B.
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Detailed Solution
Both Cnidaria and Ctenophora exhibit tissue level of organisation.Alternation of polyp and medusa stages (metagenesis) is a phenomenon observed in Cnidaria (but not Ctenophora). Ctenophores have colloblasts for anchorage and comb plates for locomotion. These structures are absent in cnidarians.