Tentacles of ctenophores contain

Options :
  1. cnidoblasts
  2. colloblasts
  3. digestive glands
  4. all the above
Answer and Explanation :-

Answer: Option 2

Explanation:

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He hesitated, remembering something Finnikin had said to him on their journey. That somehow, even in the worst of times, the tiniest fragments of good survive. It was the grip in which one held those fragments that counted.
-Melina Marchetta Finnikin of the Rock