Biology
The scientific study of how organisms interact with their environment is called

Evolution
Zoology
Ecology
None of these

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Biology
Normal adult human male has

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

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