Biology
Most fish do not sink in water because of the presence of swim bladder air bladder air sacs air in spongy bones

I, II, III and IV are correct
I and II are correct
II and III are correct
III and IV are correct

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Biology
Normal adult human male has

10 gram of haemoglobin/100 gram of blood
18 gram of haemoglobin/100 gram of blood
14 gram of haemoglobin/100 gram of blood
24 gram of haemoglobin/100 gram of blood

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