Homeothermic animals maintain their temperature by increasing the metabolic rate, increasing the breakdown of brown fat, muscle tremors, hibernation, sweating, and adaptive behavior (choosing places for protection from heat or cold). Heat-insulating covers (feather or hair), subcutaneous fat, vascular reactions (expansion and contraction) also contribute to a decrease in heat loss.
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.