Biology
Biologists mainly deal with matters relating to

All three a b and c
Living part of nature
How life works
Non living things influencing living things

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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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