In the skin of mammals, there are four types of glands: sebaceous, sweat, milky and odorous. The oil secretion of the sebaceous glands lubricates the hair and the surface of the skin, which makes them waterproof and elastic. The secretion of the sweat glands is involved in thermoregulation. The modified sweat glands are the lactiferous. The secretion of the mammary glands – milk – female mammals feed their young. The scent glands are also modified sweat or sebaceous glands. Their various secrets are used by animals to recognize individuals of their own species, to attract individuals of the opposite sex, to mark their individual territories, to protect themselves from enemies (skunk).
Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.