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

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

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Biology
In Photosynthesis

Light energy is converted into chemical energy
Chemical energy is converted into electrical energy
Light energy is converted into mechanical eneargy
Chemical energy is converted into light energy

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