Q.

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.
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