Indicate the derivatives of the skin that are present in mammals as opposed to reptiles.

1) Sweat glands – participate in thermoregulation, keep it from overheating (perform an excretory function)
2) Sebaceous glands – perform a protective function (lubricate hair and skin, giving them elasticity, reduce skin wetting in mammals.)
3) Milky glands – form and secrete milk for feeding offspring
4) Hair – performs the function of thermoregulation (vibrissae perform the function of touch)

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