Why don’t reindeer freeze even in severe frost? What protects them from the cold?

It turns out that the deer has inflatable wool, the hollow hairs are filled with air. Since the air does not conduct heat well, such wool protects the deer well from the cold.

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.