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Hair erection by attached muscles in mammals is mainly concerned with

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Greater reception of stimulus of touch

Faster evaporation of sweat for cooling

Frightening the enemies

Greater insulation for preservation of body heat

answer is B.

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Detailed Solution

The erector pili muscles, also known as hair erector muscles, are small muscles attached to hair follicles in mammals. Contraction of these muscles causes the hairs to stand on end, known colloquially as goose bumps (piloerection).

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