(C) Bioluminescence (the property of a living organism to emit light) is a well-marked characteristic of the phylum $Ctenophora$. These organisms are

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(C) Bioluminescence (the property of a living organism to emit light) is a well-marked characteristic of the phylum $Ctenophora$. These organisms are commonly known as sea walnuts or comb jellies. They possess eight external rows of ciliated comb plates which help in locomotion.