Biology
Our skin, when exposed to excess sunlight, becomes dark. This is because our skin pigments called

flavoxanthin
melanin
Xanthophyll
carotene

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Biology
Normal adult human male has

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

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