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B
Nematocysts
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C
Body cavity
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D
Tentacles
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Solution
The correct option is B Nematocysts Hydra is a coelenterata as it possess cnidocytes/cnidoblasts that have stinging apparatus or nematocysts for defense, locomotion and capturing of prey. The nematocysts can paralyze their prey by releasing neurotoxin when they receive mechanical stimuli. This is one of the most distinguishing characteristic of coelenterates.