What is common between the trichocysts of $Paramecium$ and the nematocysts of $Hydra$?
- AAttachment and defence
- BDefence and offence
- CSensitivity
- DFood capturing
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$1. \text{ Osculum}$ $p. \text{ Fasciola}$ $2. \text{ Hypostome}$ $q. \text{ Ctenoplana}$ $3. \text{ Comb jellies}$ $r. \text{ Spongilla}$ $4. \text{ Hook and sucker}$ $s. \text{ Meandrina}$
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