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B
Coelenterata - Nematocysts
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C
Annelida - Segmentation
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D
Monera - Eukaryote
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Solution
The correct option is D Monera - Eukaryote Choanocytes are distinctive cells line the interior body walls of sponges. These cells have a central flagellum, i.e., surrounded by a collar of microvilli. The primary function of choanocytes is to assist with circulation.
Nematocysts are specialized stinging cells specific to coelenterates that act as organs of offence and defense.
The annelids, which includes leeches and earthworm, are segmented animals.
All the organisms of Monera kingdom are prokaryotes and not Eukaryotes. They are single-celled organisms that lack membrane-bound organelles and have a single chromosome containing all their DNA. Hence, option D is correct.