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General Knowledge - Biology - Discussion

Discussion Forum : Biology - Section 1 (Q.No. 8)
Biology
8.
Most fish do not sink in water because of the presence of
  1. swim bladder
  2. air bladder
  3. air sacs
  4. air in spongy bones
I and II are correct
II and III are correct
III and IV are correct
I, II, III and IV are correct
Answer: Option
Explanation:
No answer description is available. Let's discuss.
Discussion:
31 comments Page 4 of 4.
Aaghar badshah said:   8 years ago
Please explain the answer.
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