Biology
The bacterium which reduces the fertility of soil is

Azotobacter sp
Nitrosomonas sp
Bacillus dentificans
Nitrobacter sp

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Biology
Normal adult human male has

24 gram of haemoglobin/100 gram of blood
10 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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