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As the age advances, there is a gradual thinning of hair in human males. This is mainly because of lowered

1. blood supply
2. synthesis of proteins
3. synthesis of glycogen
4. availability of energy

Correct answer: synthesis of proteins

Solution

Hair is primarily made of protein (keratin), so reduced protein synthesis with age directly weakens hair production and leads to thinning. The other options are not the main limiting factor for hair formation.

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