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B
Porifera and Coelenterata
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C
Protozoa and Annelida
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D
Porifera and Annelida
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Solution
The correct option is BProtozoa and Porifera Proterospongia is a genus of a single-celled aquatic organism, which forms colonies. It belongs to the Choanoflagellate class of the protist kingdom. It is the connecting link between Protozoa and Porifera. Proterospongia colony resembles sponges closely.