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

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

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Biology
Normal adult human male has

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

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