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The figure given below is the characteristic structure of the phylum in which animals are aquatic, free swimming or sessile, mostly marine, radially symmetrical. Identify the phylum and correct function of the structure. 
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A. Ctenophora; Emission of light.

B. Porifera; Feeding, respiration and excretion.

C. Cnidarian; Anchorage, Defense and food capturing

D. Mollusca; Locomotion, transport of food and respiration.

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